There are too many issues to list, some caused by a different distro and some by misconfiguration that is just too much to undo. The FPS lag I have no idea what the cause is and it really only happens in newer games. Almost everything is “mild”, the games are just less enjoyable.
A few years might be a bit too many, the next round is on W10 death at the least. Before trying Desktop Linux out half a year ago, I knew Linux CLI which made most things easy. It’s just that I don’t have time to debug things I have no clue about.