Microsoft would not want to stop since it keeps users locked in to Windows. The majority of games now support Linux according to ProtonDB, but the few popular games that don't are almost always due to a kernel level anti cheat.
People always take the path of least resistance which is Windows on the laptop/desktop that they bought at Best Buy. They won't reinstall their OS because they don't know what it is.
Is this known behavior documented somewhere I can learn more about?
With proton a lot of games now run quite nicely asides from the ones that require anticheat systems.
(and no, already using linux as daily driver doesn't count, none of those folks were even remotely impacted by this windows-manufacturer-signed rootkit-on-windows problem.)
This is misleading IMO. The dashboard doesn't do a good job of letting me know what proportion of mainstream games (from Ubisoft, EA, etc) are supported. And what the performance delta is.