Earlier quoted context omitted.
I never had macOS remove those files automatically when dragging the app to the trash. I still have files left from 4 MacBooks ago (for apps I haven’t installed in a long time) because I’m always migrating the home folder. I guess they’re just expected to be left behind in case you change your mind and want to reinstall the app later. That way you’ll still continue where you left with the same settings. They’re inert…
> I guess they’re just expected to be left behind in case you change your mind and want to reinstall the app later. That way you’ll still continue where you left with the same settings. And if apps are well behaved, only writing tiny config files in ~/Library/Preferences/ and the like, it’s not really a problem. The amount of space taken up in that situation was tiny even when OS X 10.0 was brand new and 10GB was a c…
Apparently they do this so they can control when it's updated, without having to go through any OS controls.
Needless to say, when people "delete" it they often are just deleting a stub rather than the actual multi-GB file set. :(