You can easily double the unit limit. find the "totala.ini" in the root folder and change UnitLimit to 500.
Yuo can have more butyou need a patch if I remeber correctly.
Yes they are less shit for most people. I'm on PopOS and had both a 6650xt and a 6900xt. Almost all games works to the point Linux compatibility as become an afterthought for me now. The main tinkering is selecting a version of Proton or ProtonGE.I feel I have to do this less and less.
It's seems to be what most of AMD card experience, but i didn't dig on numbers.