Catch up mechanics devalue gear and makes players dont bother to play and progress their character becouse few weeks later everything gets faster or completly reseted so why bother. Expanaion resets are fine btw.
Accwide essences: 1. Issue of forcing people into playing multiple alts in order to make essence progress faster.
2. I spent 150h on getting rank 3 essence but my alts i didnt touched at all got it for free why? Character what i play have to go trought grind and my other doesntand thata alt. If alt can get free essence, mains should too.
If i play only 1 char and spent 200h on him that char should be more powrfull than someones 200h splited between 5. Otherwise its completly umfair to people what just want to play 1 char those players deserve to have more powerfull character if they spent same amouth of hours than others 5 alts.
Owning multiple mains also hurt player identidi and wow community as you no longer can recognize players by class thei play.
Players character invesment is gone. If you let players free swap betwen classes thanks to accwide progressionn players will stop feel investes in their characters = they are morelikely to quit game. Being able to play multiple alts do not make players play longer it makes them quit faster becouse there is 0 investment in any of those characters which mean players doesnt care about his characters = players doesnt care about game = they quit.
Thats just few from top of my head during launch. There is plenty more neggative impacts on the game. Only shows you have 0 knowladge about game desing and its impact on human brain. You aproach game like robot. You completly ignore what psychological impact have different systems on players mind and how they aproach game. Prople wont play your game just becouse they have 4 more alts they can play but experience is hollow. Creating game around 1 character with fullon investment retain players far more.than allowing them to play multiple chars regardles of time and effort. From TBC to Cata i have never quit playing mage no mater how good or bad he was. Since then with all the catch ups and accwide garbage it become far more easyer to swap my class and i stoped giving **** about what i play which made me quit activly playing for long period of time.

(Seriously, whoever is responsible for that, bad word you)