> Why would anyone use this platform?

I dual boot Linux and Windows. These days I need to boot Windows a lot less, but I still occasionally run into problems related to games. Usually anti-cheat systems picking a fight with Proton, but also some examples like Terraria 1.4 running in a 1080p canvas in a 1440p window as they updated a library which their Mac/Linux guy had patched to fix window size on those systems to a newer version, but not new enough that it incorporates the patches to actually fix the problem.