PC Gaming

In my own personal experience, as a gamer and having switched my main machine at home to Pop!OS some months ago, it's more like "need Windows to run nearly 5% of games" thanks to Wine and Proton which work as adaption layers to let Windows programs (not just games) run in Linux.

(Curiously I use a lot more Wine with Lutris than Proton and Steam, so my success rate is even down to how far the main Wine project got, rather than any special juice that Steam might have added on their Proton branch of Wine - you don't really need Steam or Proton to run most games in Linux and the success rate for just running games from GoG or even pirated ones is just as good and from some games it's even the case that the Steam version won't run but a pirated version runs just fine, probably because it was the DRM that the pirates cracked that caused the problems).

Mind you, at least in my games collection only maybe 1 in 20 have native Linux versions (which is still better than 99% of games being Windows only), but because of adaption layers like Wine and Proton, for most games you can run the Windows version of it in Linux.

Absolutelly, in the old days it definitelly was the case that Windows was needed for nearly 99% of games (I should know: I've been trying to switch my gaming to Linux since the late 90s), but that's not at all the case anymore.

Your idea of how hard it is to game on Linux is at least 1 decade out of date.