Not sure if this was a fluke or if there's some new API that Steam now supports (or if they've always been able to do this), but dragging Steam to the trash and emptying it brought up a dialog asking if I also wanted to uninstall the games that I had downloaded (which are of course stored elsewhere).
I wish I had taken a screenshot of it, but I wasn't really paying attention (I wasn't meant to delete Steam in the first place
).
I wish I had taken a screenshot of it, but I wasn't really paying attention (I wasn't meant to delete Steam in the first place