The biggest problem with (GNU/)Linux is just there is no unified platform, and every distribution just wastes time on reinventing the wheel. And if you need to do something more advanced stuff than browsing the web or reading e-mails, you eventually encounter some silly problem where you need to copy random commands you found on the internet, because there’s literally no other way to configure anything except some very basic stuff like internet connection settings or wallpaper.

I personally don’t see any progress on UX in the last 10-15 years, and some DE’s even go backwards (GNOME), where you need to install an extension just to get desktop icons working, which should be a built-in feature.

The only thing that happens to improve UX lately is the fact that you can easily install flatpaks/snaps, so at least developers don’t need to waste time to repackage their apps for hundreds of different distributions, and users don’t need to hit their head whenever they encounter a dependency error.