I have levelled several characters to 60 this month before deleting those same characters and what I understand about that is that there is an absoloutely rediculous gear disparity in the game, assuming a tank starts to dungeon fresh off the opening scenario boat, his health will get utterly decimated because the gear from that beginner is not even close to adquate for the dungeon assuming you miss one or 2 pieces of it, this means you will have tanks that are actually missing armour pieces in your dungeon while also being at the absoloute minimum item level so a level 10 tank with barely 16 ilvl will be up against another with like 50 ilvl and something like 10x the power on the same level.
I got one or 2 funny comments when levelling my seed warlock about what the bloody hell that high damage output is because of the scaling.
In theory they could solve alot of this by allowing you to upgrade to ilvl 30 or so before the end of the opening scenario.
Sorry to tell you this but you just played bad there. And deserved to die the plant packs hits like a truck and is a pain to gather up with dps instantly bursting getting your mitigation up at the same time as getting threat on mobs that spread out can be really annoying.
And
Then you really have not used it before as that is SUPER SUPER common.
Not saying you are wrong and i am sure there are cases where players do that.
a) How do you know if the player is an expirienced dps player but is just q’ing as tank to “save time”?
Any expirienced WoW player is probably going to be “okay” in a levelling dungeon while playing on an off spec. If they completly fail, like you described then i would question their level of expirience as a player or their level of expirience in that particular dungeon.
b) If it is a new player to World of Warcraft then think back on how you started. Did you know about all the guides, addons and tools and knew what is good or bad at the start of your journey / expirience?
I highly doubt that you did and in fact i am pretty confident in saying that you have also ruined someone’s expirience at some point. I know i did when i started levelling my shaman, new to the class and new to the dungeon, but instead of getting flamed i was given advice on how to improve.
Despite popular opinion, tanking is not the easiest role in the game, that requires tons of attention and thoroughful thinking of how and when to use your CDs.
In the last few weeks I’ve been actively doing m+, and I’ve met lots of different tanks - solid, paper-thin, competent, clueless, etc. Just keep it in mind, there are as many different scenarios of how your key will go as there are people playing the game. One key you complete effortlessly and the other one you struggle with.
Just do what YOU can do best, stop criticising people around and you’ll find yourself in the most joyful environment ever - cool and rewarding m+
I used to tank once upon a time. While I would never call myself a pro-tank I would call myself competent. I played feral combat druid, or as it’s now called, guardian. Back then they had a very small toolkit so you had to know how to corner pull and such like.
If someone doesn’t know the basics of tanking and just runs into a dungeon then they are selfish, there’s no other word for it.
There’s you tube videos these days with the encounter and a bloody guide in the game which they refuse to use. Detailed guide on how to tank. even per encounter.
I decided to level a priest from level 1 solely in instances. The issue is any tank acts like they are over geared. Generally speaking if you pull a pack at a time then you can use your single target spells to keep reasonable control but if you pull multiple packs death for every one.
How did you come to this information? Killed yeah, but no aggro, no burst b4 tank. Actually, got killed twice, first when sac’ed this crazy guy (and didn’t expect this damage to be fatal lul) on 2 packs of trash before the tree boss and then when we almost killed the tree man, dh decided not to press anything or it was whatever else, but he just died to the plants within just 5 seconds when boss was 25%. So I died the second time after him
Guess really answering this by explaining to the OP why people like him are an enormous problem for the game is senseless, since this has been done multiple times.
Still, the combination of toxic people like OP and the fact that BfA dungeons are WAYYYY harder than any other expansion at the moment, make for a incredible bad newcomer experience (And the newcomer experience is already not that good anyways).
Imagine people that pick up the game (Especially casuals, like my GF for example) that are not really into all the guide reading and stuff (They might become accustomed to it at some point, but not at the start of maybe their first MMO). They go into these dungeons, excited about the experience, and are faced with quite challenging content (Due to the current scaling of BfA dungeons) and very toxic players like OP that will immediately trash on them for failing. What do you expect they do? I bet most of them just quit at some point and play something else.
And the toxicity problem does not end there. Even more common is that type of toxicity in LFR. LFR is literally MADE for heavy casuals and/or people that are very new to the game. Still, there are people vote-kicking others that messed up (Especially tanks). And the toxic people are actively hurting the whole game with that.
most dps main players will always try to dps no matter what spec they play …
they dont get what active mitigation is , for example most of them probably think ignore pain is a “oh shet” cooldown, its always the healer that has to carry these knuckleheads.
their braindead logic will always be to do more dps than the others.
i do that myself sometims too when i dont have bubble for big pulls ready 
love?