[riolu]

> Note that if I am trying to fix an app that I want to keep using I sure as hell may want to keep the preferences.

Of course, `man defaults`. You can modify the preferences and potentially fix it, backup preferences, etc. Again I must stress that you use `defaults`, the .plist on disk isn't always accurate even if you terminate the app and reboot the machine.

> The case where I want it to auto clean up is where it is repeatedly broken and I never really got to using and configuring it yet. It's pretty rare.

There isn't really a one size fits all perfect automatic solution. Not all apps are good macOS citizens.

[throwaway290]

So the only scenarios automatic uninstall is useful are far and between and even then no one size fits all, which is why I don't like the idea...