Moonlight works flawlessly for me and I use FreeBSD as a daily driver. Of all OSes to play games.
UnRaid + KVM VM + GPU Passthrough with Moonlight has meant I no longer have to dual boot to game.
60FPS at 1080p on a 4k screen. 4k struggles but I think that's more my GPU then anything else. I do have 2x of them.
I'm assuming you don't play many games with anticheat though since they'd flag it running in a VM