I'd quote your own example from Anno -> "multiplayer never worked". Thats the "doesn't run" part. I always play Anno 1800 with friends. It has been my experience with linux gaming for a while - anything that involves multiplayer usually doesn't work, either because its just broken (less likely) or because its specifically stopped by the developer (anticheat, etc..). Reality is though, that most mainstream games (as in, biggest player counts and as such, the games most people are playing) do not support linux. If my Valorant or League of Legends or Counter Strike or Rust or ARC Raiders or Marvel Rivals don't allow me to play on linux then the state still is "linux can't really run games yet".

How do you fix this? I dont know - most of these are the developers refusing support because of anticheat or just support overload, but it's insane to suggest that linux works for gaming when the most played games in the world straight up do not work. I'd love if linux was more viable though, can't wait to ditch the slowness from windows.