These days many AAA games work well in Gentoo thanks to Proton, though I still dual boot (to Windows 7...) for a lot of games. Looking Glass is pretty cool, though perhaps it's a bit too late. My next Windows on a new computer will be either 10 Enterprise LTSC or 11 if 11 doesn't suck, but I still plan to run Gentoo as my primary. If your NixOS experience matches your expectations over the next year, it'd be neat to hear about it later -- I looked at Nix a long time ago but I've been a happy Gentoo user since 2007 and I still see no reason to move. I've gotten a bit old, but the maintenance is low, every time I use another distro it inevitably annoys me for not being like Gentoo, and anyway the upkeep sort of feels like gardening, not like a pain in the butt.