@andrewt @sjuvonen For gaming there might be issues on nvidia but amd has been great to use with the open source amdgpu drivers for over a decade at least. Once something is working, it'll almost always work forever on Linux.

Gaming using Proton via steam is seamless. Heroic launcher for GOG and Epic games is a community effort to create a similar experience for those platforms.

Use gamemode (for example set launch option "gamemoderun %command" on steam) to have better graphics performance.