I’ve come to believe that this is less an emacs problem and more an “emacs plugins that try to do way too much stuff / take too much control” problem. I’m on vanilla emacs (I don’t even use use-package) and my config never breaks any more, even when upgrading major emacs versions. I think it’s about doing things in harmony with the emacs way instead of trying to take over the UI/UX. Emacs Live was always broken when I was using that.

use-package is now in standard Emacs, so I would count that towards the Emacs way.

But I agree that it is very stable and for me also doesn't break, even though I use use-package a lot and install many key packages. Maybe it is important to note, that I don't need everything there is out there and that I remove not well working packages quickly after trying them. From time to time I also look at my init file and get rid of no longer used stuff.