I’ve run Linux for years on servers and in VMs in VMware Workstation, but not my main OS because of games. I’ve tried before but games just didn’t work well. Tried again recently and the games I’m playing now worked with no issues with Lutris and Steam. I could already do “everything else” on Linux so this is the longest I’ve gone without booting back to my Windows disk. Already have a Kali VM in virt-manager and will add a Windows VM if I hit an application snag. But so far haven’t had any app issues. If this continues I’ll be wiping the Windows disk to make more space for Linux.
Yes because Valve maintains their own compositor. You can enable that HDR support on desktop as well through some workarounds but it's not really usable outside the SteamDeck yet.