Well it depends on your DE. If you run Gnome, you will probably be fine. If you run Plasma you can run into problems but supposedly Plasma 6.0 is going to release with full Wayland support at the end of this year (or beginning of next one) so lets hold our thumbs for that.
Personally I’ve ever only used Gimp even when I was on Windows. I wonder what gimp could possibly even do better to compete with photoshop. There’s also krita of course which is very popular but I’ve never tried it, gimp has just been everything I’ve ever needed from a drawing program.
I use Lutris to install my GOG games, Battle.NET, EA launcher, and Ubisoft Play. It’s a very simple solution.
A good alternative is abiword. Don’t know if it exists on Windows tho.
Not even MS alone, it seems that my American colleagues are vendor locked in several different ways. It’s a bit bewildering honestly.