I don’t want layering or sharing or whatever it is.
Easy. I’d change the release date to August 5th, 2019.
Nice, I was hoping for something gameplay wise.
Remove cross realm bgs
the only thing I would change is client v. 1.0 instead of 1.12. going back to day zero would be best world scenario
I’d allow my retail character to send my classic character gold. Even just a 1gold limit to get started. Being unable to afford training etc at low levels sucks, lol.
No layering, No Cross Realm BGs , however i would be cool with the meeting stones actually working.
If this is already a thing, please forgive me as I’ve not read anything about it but…
Proper support for multi-core CPUs. I’m sure my beefy gaming laptop will have no trouble running the game but I just want to be able to get my 144 fps 
Remove paladins.
A little more serious answer, use 1.11 instead of 1.12.
IF YOU COULD CHANGE ONE ABOUT CLASSIC WHAT WOULD IT BE
Less posts about trying to destroy the game by removing layering.
Remove party/raid wide dishonourable kills and make them apply only to the person that killed them, or remove the DHK system entirely.
Triumphant return of the revolving nerf bat, just like in vanilla.
I would add flying.
My one thing I would ask for… stop allowing people to ask for it to change.
I want TBC game mechanics set in a vanilla WoW universe. No flying mounts.
TBC talents, gear sets, honor/arena system, and the general cleanup of abused/ unfair/boring/ noncompetitive mechanics of vanilla WoW.
No more unlimited world buffs, low level broken items like tidal charm, skull of impending doom, 30 second free action potions, magic dust, or items like manual crowd pummeler.
TBC was honestly better but was horrible because it made all old content irrelevant and scattered most of the community.
I would have it release tomorrow
I’d put in a Skeletor skin, just for me.
i would add demon hunters and adjust them for classic
Really? Why demon Hunters?
Unless you’re going to 70 too, TBC talents would be horribly broken in a 60-capped world.