Depending on where you look, Linux on the desktop has somewhere between 4-6% user share on the desktop. Showing it's growing slowly but steadily overall.
GE-Proton 10-10 is out now with the latest version of this community maintained compatibility layer for Linux systems bringing plenty of Windows game fixes.
I don't need another controller, at this point I have 7 but another couldn't hurt right? The 8BitDo Pro 3 Bluetooth with swappable magnetic ABXY looks lovely.