They definitely use it for more than that, because I'm sure I've seen it ship with Windows games as well. Also there's exactly 2 ways to get a window on Linux,

They definitely use it for more than that, because I'm sure I've seen it ship with Windows games as well. Also there's exactly 2 ways to get a window on Linux, and those 2 ways are common to pretty much every modern distro. Same as audio.