Yeah, I ostensibly haven't switched back so I don't have to deal with anti-cheat issues, but if I'm really honest with myself I don't game nearly as much as I used to and when I do it's usually single player.
Yes but I understand that you might not want to cut off the possibility. I personally dual-boot, but for similar convenience reasons I have some of the games installed on both systems.
Even dual-booting is a bit of a pain, some of which I have solved by having a dedicated SSD for each OS. Windows sometimes misbehaves and it's easier to handle that if it has its own drive.