Gnome is currently the least stable major desktop. By far. It's an absolute disaster crippled by tons of little bugs that creep in when you least expect them. Even if you don't add anything to it and use Gnome as vanilla as you can get it, it's still going to be problematic.
Plasma has some small bugs here and there -- and there was a point a few years ago when Plasma seemed like they didn't care about bugs and instead just threw out a ton of shiny new pointless features every release instead -- but recently it is incredibly solid in general and more usable than anything else in Linux, by far. One of the only things I find "buggy" about Plasma is when someone tries to over-rice the desktop with tons of widgets and other things everywhere.
The biggest lie of programming these days is just because something is coded in [trendy "secure" language of the day, including Rust] means it's secure. Bullcrap. It's how you code things that make it secure or not. You can be proficient enough in C to make programs that are much more secure vs. rust. The fact that everyone makes mistakes and programming is an enormous beast to wrangle with makes things insecure and needs to be monitored and fixed.