You need to have a lot of spare time to invest
Otherwise you just can’t do it and even if you can sink 10 hours a week, you’re just wasting it because you’ll never get anywhere and no one will accept you because “you’re a noob” and “not up to the game” etc. In WoW Classic you will eventually catch up as there are no crappy weekly torghaist and dailies to keep up or vault rewards, you can play the game on your own pace and eventually you will reach end game without worrying you missed some dailies or weekly grind.
Monthly changing rules, meta-game and other gamers
You need to really study the game to be able to not get murdered all the time. And guess what, all that studying just went down the bin because they changed the rules again! Look up how stupidly meta changes each season!
Which means all the work you spent over last 3 months building up your character is now wasted and your character is the worst character in the game after getting nerfed, not that you ever got to the point of actually being able to enjoy it’s powers while it had them.
But worry not - you’re going to get roflstomped by everyone else all the time with insults thrown at you because you have a job and family and cannot ever hope to be even remotely competitive or even be able to avoid being just target practice for those that have more hours to commit to being able to slaughter other gamers. While in Classic your character won’t be turned into joke next season because someone at the Blizzard is upset that this class is better than another one.
Lvling is actually fun
Yeah lvling in classic with friends can be viable and also challenging, you are not supposed to follow some story line or GOGO rush it, you are making your own adventure and with friends it’s fun. Enemies aren’t scaled to your level so with more people you can take on threats you wouldn’t be able to beat, you are exploring and make your own story and so do other players around you and then you all meet up to take on bigger threats like Lich king or Illidan.
“wow was an adventure, where you could do anything you wanted to do, and each quest you did have you a different adventure, now everyone has the same quests, doing the same thing, it makes a mmo in to a single player game with other people”
Gear and mounts
In classic you will get excited once you get your first green item, having a mount is super awesome experience. There is also racial identity, gnomes are on their robot chickens, humans got horses, paladins got battle horses, draenei got elephants etc… In retail andies just collect mounts and they are all same, they mean nothing they all got same speed while in classic each mount is unique.
Gear means something when you get something from a quest you know it’s special and not just something you know you are going to discard eventually it’s not same gear that is just slightly better than your previous item as i said it has a soul and it’s not just dumb ilevel like in retail, classic gear has soul while retail gear is just number without any soul at all.
Dungeons and socializing
Here is something what retail andies hates so much and that’s socializing, you see dear viewer they are used to just spam dungeons with their LFD system and it’s a damn problem for them to ask people for dungeons or raids because communicating is a skill they never and won’t ever lvl up, people once you make a group talks to each other and after dungeon is over people just don’t leave the instance without saying bye.
Dungeons are also more challenging and hard, getting wiped is more punishing, there are factors like mana keeping and many other things you need to know and it makes normal pubbing dungeons actually exciting and not boring chore like we have in retail.
Open World PvP actually is viable and more engaging
People complain about twinks and max lvl players killing low lvl players but that’s the point of PvP there is no flying until you reach Outland and Nothrend and that is if you can afford it, everything is on the land so you cannot fly to avoid enemies. You also meet levelers and you have diversity, you aren’t forced to only fight pvpers like in retail where pvp in open world is a joke and ghost town.
It’s your own adventure you are not following a path created for you
As I said previously this is your own adventure, you are crafting your own story, your character lives and you are part of the world, your game isn’t butchered for endgame content so they water down lvling, scaling, skills and everything for the sake so players can speedrun this process and grind for endgame stuff.
You aren’t forced to follow Blizzard disney stories in order to beat the expansion, you can take any quest you want and make your own story and that’s something what retail simply don’t have and why retail andies will never understand that in classic there are many other ways to enjoy the game without rushing the endgame content. Oh yeah and I forgot no more stupid transmogs! So no more transmog whoring yeah that’s another positive classic has!