Linux is perfectly fine for GUI users. It's really great for most common use cases. You might have issues with games (or so do I've heard), but I'm not a gamer and don't know much about this... Steam has helped make games on Linux a lot better. I just play supertux or supertuxcart or mahjong once in a blue moon and am happy.

Most things work perfectly - stick to Ubuntu or Fedora or opensuse. Once you get the hang of things, things actually feel better on the Linux desktop:

• much faster than Windows
• no tracking
• highly customizable
• if you ever get into it, you can script your setup to be easily replicable across machines

Things that you'll have to fight

• fingerprint scanners - only a small subset work. My Dell latitude scanner works perfectly though.
• some printers might need manual driver download/install
• some software is only built for Windows (less and less of those these days, unless you're doing something specialized)

Nah I put my parents and grandparents on opensuse so I don't have to constantly clean up their viruses. Just installed whatever via flatpak like bottles for running my grandma's old mahjong tile matching game in wine. They haven't asked for help with anything else since and I can actually relax sometimes now.

Hardest part was installing the printer driver I guess. For anyone not comfortable with cli installers anyway.