Before you get your pichforks, I started WoW in summer of 2005 and have played retail ever since.
WoW has gotten a lot of quality of life changes over the years, things we take for granted now but have gotten used to, such as autodismount, shiftclicking on equipped items to replace items, stuff like that.
Vanilla WoW is will be damn near impossible to transition to for people used to the convinient new non-gameplay systems. How do I know that? Because people use like 30 addons to make vanilla wow "playable".
People who raid on a competetive level use like 30 addons lul. Should blizz update life quality changes for the things that people use addons for anyway?