Just because the original response seems so ignorant. Like have you actually tried it? Have you looked up the user experiences? Why am I supposed to provide the links when you are making the claim? As another user mentioned most things are seamless to run. Yes they require wine/proton as a compatibility layer, but steam does it seamlessly, it is as easy as enabling the compatibility in steam options and pressing install, then play. And this generally works for non-steam titles as well, you just add the non-steam title and let steam handle the rest.

The OP of the video wrote himself that his process for setting up the games in the video was : install OS, install steam, install game, launch game on both windows and linux.