Not the original poster, but my experience was fairly smooth. I had minor issues with wifi drivers, and I got a new GPU that had some driver issues because it was pretty recently released (I guess the open source drivers didn’t have time to be updated?) In terms of actual gaming. Basically none, I mainly use steam and proton has been bliss, I’ve bought multiple games without even checking compatibility, and it just works. To my knowledge there is only one old game where the multiplayer doesn’t work, but everything else has been seamless.