It's not that people aren't willing to put in the effort to optimize games for Linux, it's the reality of graphics drivers being effectively a massive collectio

It's not that people aren't willing to put in the effort to optimize games for Linux, it's the reality of graphics drivers being effectively a massive collection of bugs and special cases for specific titles or common programmer errors. If you have a direct line to the manufacturers like Valve does, you can ask for bugs to be fixed, for specific optimizations, or even for engineers to fly over and tune your shaders. For regular developers, you're happy if your game just works.