there are just too many things to fix in my opinion.
slight sound improvements
128 tick/make subtick on par with 128tick
weird interaction with objects/players, e.g - bumping into other players is awful, sometimes you pass through them, sometimes you're getting stuck, sometimes it weirdly moves you.
breaking objects in the game, for example when you knife the half window on mirage, there is sometimes some 'lag', breaking the window with a knife if you move sometimes not working.
I can't don't think these issues belong in a competitive game, sure they will eventually fix it but it's just too soon.
and if someone is going to come up with that stupid 'look at how csgo was 10 years ago' argument, just don't it's a stupid argument.