I confess I used to be like this, years and years ago. My logic, faulty faulty logic, was I only had time to invest in one or two characters. So I just crammed everything in that I could. Nowadays I dial it way back and try to keep my characters specialised as follows.
What is their main contribution in combat?
What is their secondary combat contribution?
What is their trade skill?
What is their hobby?
Seems to work much better and keeps skill creep in check.
Jokes.
Puns.
Memesmith.
Open mic nights at the local comedy club.
The thing is most of us are guilty of things mentioned here.
We improve over time (some of us do anyway), learn from our mistakes.
The issue becomes is where you find someone who is so intransigent to their own faults they blame other people for their shortcomings.
basically the Seymour meme “maybe im wrong? no it is the children who are wrong.”
Please go to the office next door to receive your official RP license.
Next!
I think the worst offenders here aren´t people who don´t have time to RP many characters but rather people who are really attached to their main to the point where they detest attending events on other characters.
I knew someone like that once and she pretty much tried to shoehorn in her beloved Mary Sue (that was actually extremely unlikeable character) instead of her other character that was far more accepted by other players.
Reason here was really just her unhealthy love for her character and I believe many who RP characters that take part in everything are doing it because they love their character so much they would rather break lore and common sense just to be able to RP on them.
I remember when I started RPing in TBC, I wanted to be the king of Silvermoon. I even had some loyal followers who supported my ignorance.
They realized I had no idea what I was doing when I showed up at the very first confrontation, throwing bombs at my opponants and shouting “What’s up Mo-foes!”
Man, I was dumb.
Now I play an NPC who hands out quests in Darkshire and offers rumors to passers by. I do agree with Darnianuth’s list, but I would like to add one more thing to it:
What does your character offer others in terms of RP?
He did add :
But your character does not necessarily need a trade skill to offer something to others.
You could be the comic relief, of your group. You can be a guard who enforces the law of your town. You can be an entertainer who tells stories at the tavern, or a bartender who knows the best gossip in town.
Also…
I am about to give an unpopular opinion, so this is a trigger warning: Less is more.
Your character does not have to be good at everything to be loved by others. In fact, it is quite the opposite. You can be a strong warrior who cannot read or write. A scribe can feel very helpful and it generates RP. Ask other characters what their skills are. IF you solve every problem on your own, you don’t need to interact with anyone.
Of course. A better term might be “what do they do for a living?” It doesn’t have to be a job or tradeskill. Just what they do when they’re not fighting or adventuring. Or when they’re not “on screen” if the character is a noncombatant.
If you get really stuck you could look up the backgrounds from Dungeons & Dragons 5e. Which more or less cover that and have tables to help figure out your personality or alignment, and a list of skills that can be gained from that background. Some are jobs, some are an upbringing, some are already stories with blanks to be filled in by yourself.
Exactly why I dialled back what spells Darianuth could do years ago. He’s near exclusively combat orientated now. Probably heroic level. But the second you ask him to conjure food, translate runes or turn invisible he’s going to give you a blank stare. And you’ll be surprised how often that narrow focus has been a problem for him since then, and interacting with other mages has been better for it.
The most utility he can do is slow fall, teleport and such. He can make portals but not to anywhere in a hurry or somewhere he’s not familiar with. This weakness has let other characters shine and things are much better for it compared to when I tried to do everything.
He’s straight up been mocked for not being able to conjure food and the like by Gandalf types, and for wasting his time on weapon training.
Same Gandalf types tend to turn around and insist on having full mastery of every school of magic. Which is a bit 
when even inlore archmages seem to max out at 3, tops.
Stuff.
Unique stuff.
I’d like to add some thoughts onto this by saying that it’s not really a bad thing either for characters to be a little bit of jack-of-all trades. Some seems convinced that if a character shows aptitude in three or more skills then they’re a Gary/Mary Sue who needs to dial back a bit.
There are extreme attitudes on both ends of the spectrum, is what I’m trying to say here, I guess. Usually folks in real life have more than one interest/hobby (and if they’re passionate enough then they’re certainly proficient in them.)
Battle-mage sort of characters seems to be getting the most flak/easy to get sorted into ‘OP character’ slot by virtue of mixing magic along with battle prowess, which is just entirely unfair. So long as the concept, (any concept at all, really!) is well balanced then virtually anything can pass for being fun and enjoyable for others.
Zizzle is a self-reliant gnomish engineer/arcanist, so she’s pretty much a jack-of-all-trades; magic, gadgets, combat, etc. She’s admittedly not too good at alchemy though.
Thing is, I think it’s justified because a) gnomes kinda stick their fingers in EVERYTHING, so that feels fitting and b) she’s not prodigy levels of good at any of this stuff. She is pretty good at all of them, but she doesn’t really know or do anything a good mage or engineer couldn’t do; maybe some creative ways to combine her skills.
This does bring up the idea of player power levels though: I’ve always been of the opinion that player characters (especially high level ones) should be better than just an average grunt, or even an average mage. The game calls us “champion” and has us go on special ops missions and kill enemies most normal soldiers wouldn’t have a chance against, after all; it is very strongly implied player characters are supposed to be superior to run of the mill soldiers.
Of course I understand some people prefer to play ‘simpler’ characters, which is cool. I just don’t like it when people start calling each other overpowered or Mary Sue for exhibiting the exact kind of power level the game tells us our characters are at.
I do not mind RPing with the Champion of the alliance. I’ve met 100s of them.
I love hosting random events in my community. I found that Champions of the Alliance get very angered when they cannot one shot an ogre skeleton in an event. Because they fought on in the war against he Horde, survived Argus, pushed back the legion and ate noodles in Pandarai.
But here is my problem with that. If I allow them to one shot the ogre, the event is over and we go home. There is no tension, no heroic moments, no rescuing a friend at the last moment that creates a bond between you and him for the rest of your life until he sacrifices himself to save you.
And I see this across the board. Simple problems like an ogre attacking travelers on the road might seem like a minor inconvenience to The Champion, but to someone who faced off against said ogre and barely survived, it is a story.
I am not going to tell anyone how to RP. Don’t get me wrong. You pay your $15 a month and can RP whatever you want and I will still RP with you. But I suggest you give it a try: Roll a inept noob who is still how to be an adventurer or a tradesman.
And if it is not for you, then, hey, it is not for you. No harm done. 
if they do this just tell them to 1shot a rare elite mob in Nazjatar and record it as evidence.
I’m just going to go out and say that on my top 5 list, just under the aforementioned “insert-real-life-influence word for word” roleplayer, is the Champion of Azeroth roleplayer. I really don’t appreciate people opening up the can of worms that is the possibility of there being countless people who are all the protagonist of the game’s story, because it becomes endlessly convoluted and complicated to justify.
I’ve not done much roleplay during BfA but does this imply people going about with the Heart of Azeroth around their necks and the like? Or is it just “Powerful heroic adventurer”-types you feel go too far?
I don’t mind characters being “on par” with the Champion/Hero/Commander/Khadgar’s pet but anything that directly involves a connection to the main characters is just hard to work around.
The people I have trouble with are the ones that assume their roleplay character is a character (or, god forbid, the main character) doing all the heavy lifting in the game’s story. It’s just not feasible to explain more than one person being the leader of a class order hall or being directly involved with powering up the Heart of Azeroth. Nor would it make sense if a hundred players all claimed to be directly involved in completing the quests we see in many zones.
Being on par with those as far as “power” is concerned doesn’t have to be an issue, so long as your character’s existence doesn’t have repercussions for the main characters of the game’s plot.
Can I just say that I wish for Vulpera to be playable sooner rather than later, so I can get down and make my Ratchet lookalike? I already have a wrench and blowtorch ready for 'mogging, and I think it’ll be a Shaman Vulpera!
Blowtorch offhand + Lava Lash makes a lot of sense.
It sort of does per definition. A lot of WoW’s big lategame threats per definition would not be threatening if Azeroth had 2500 of the Heroes™ to throw at them at once, instead of 25.
How would we fit all of them in the boss room though?
We wouldn’t need to, we would just continously grind the boss down with an endless stream of Heroes™.