But honestly, what would be better?

No launchers at all? They do help to organize the game library, synchronize saves across devices, enable achievements and friend lists, make it possible to share game libraries, install all your games from a single place, have a shop to discover new games. Steam even provides basic APIs for games to enable multiplayer. Many of these things could be baked into the game, though that would be extra work some devs might not do.

One centralised launcher? Such a monopoly might lead to problems such as higher prices / less money for game devs (especially the good indie studios that don't have negotiation power), less innovation around that launcher and less effort towards a good experience with few bugs etc.

Vote with your wallet then. Stop buying games from terrible companies. Oh right, you prefer to just rant and literally change nothing in how you live life.

See, you guys don't know what you want. First it's not okay for you that you have to use steam to play only three games and now it's not okay that there are games you don't have to use steam for... wtf!