Sure, maybe. Though eventually one may find lots of edge cases. What about files in the root that get deleted? What about programs that put wanted state within config dirs? What about programs that ignore symlinked files? What about when you’re hacking on your dotfiles and break everything because the active config is the config being edited? What about when you need to vary based on system? What about…

I mean, yea, if it works for you, great! But all of the above are problems I did have. I grew a custom install script for years. Now I use Home Manager and the impermanence module.