I use Linux (primarily NixOS and Arch) for most things. I like MacOS for work, too, though.

The one thing I keep Windows for is gaming. More specifically for game streaming. Steam Link works okay (and is cross platform), but I haven't seen anything as performant and meets my needs as much as Nvidia Gamestream (Windows-only for server-side streaming). I use Moonlight to connect to it. I haven't found any alternatives that work as well that are also available for Linux.

I wish there were a game streaming application (open source preferably) as performant as Gamestream that worked as well on Linux.