Before i start id like to mention that i did experience classic wow and this is my opinion,i might be wrong but i really doubt it.The only good thing about classic was the community and nostalgia.I will always remember my first orc warrior character,it was an amazing feeling,the music,graphics,ambience etc.
I also remember my first time doing quests in a group with another person,it was such amazing feeling back then,while thats not a big deal today.I remember clearing The Black Temple in TBC for the first time,i was talking about it for days with my friends.Classic was the first experience of WoW for us,people were knew to the game,curios and careful thats why the community was way better back then.Today,we learned the game,most of us want faster gameplay/progression,less grinding,faster leveling (some even want to get rid of leveling) more content etc.
Most you dont remember or simply refuse to admit that vanilla was way worse then you think.Leveling could take months,griding was horrible,no mounts till lvl 40 (which were expensive as hell),raids/dungeons mechanics were so simple and bad in comparsion to modern ones,no transmog,you looked pretty much the same as other 200 guild members.Eating for 2 mins after every god damn fight,class imbalance was so bad that we could call legion the king of pvp,i remember quite well retri paladins and pom pyro mages literally one shotting people.No draenei and blood elves,no paladins in horde and shamans in alliance,no LFR,dungeon finder - where you could spam for hours and eventually wipe the raid in 10 mins and leave,then repeat.
There is tons of other things to mention but i dont want to make this thread huge.I understand that SOME of you like this,but i completely disagree that vanilla is liked by the majority of people and is better than current wow.I can bet that vanilla servers wont reach over 500k subs.Many will realize this and go back to retail,just watch and mark my words.However, good luck to you, im not going back to fight against my nostalgia.