Valve has done amazing work with Steam Play. Seeing how well the steam deck plays games convinced me not to put windows on my new rig.
I don’t agree, however, that it just works. My graphics card needed a mess driver outside of the default repos for Ubuntu lts, and my gpu has been out for almost a year.
I also have one high dpi monitor and one standard-ish dpi monitor, and scaling them independently, moving windows back and forth, and going into and out of full screen games all produce undesired behavior. It’s annoying enough that I now just use one monitor.
Ubuntu LTS is generally used for servers, but if you are going to game on it you should consider using a container such as flatpak. It will share a kernel with your host OS (so if you need a newer kernel you are out of luck) but will be packaged with a newer version of Mesa. Installing drivers outside of the official repos can be a PITA because you often have to re-do everything when you upgrade your OS.
edit: should mention flatpak won’t make your OS work itself. You’ll need a newer distro for that. Ubuntu only gets major software updates for six months until the next release, everything after is minor adjustments like security updates and bug fixes.
