I think it's a very useful way to assign "goodness" to a team. The three buckets might not all be the same size, but they are close.
Rob Neyer wrote a book many years ago about the "best" all-time baseball teams, one of his categories was something like blowout wins (I think it was by 4 or more runs) to measure greatness. I think the '27 Yankees had an incredible number of wins by more than 4 runs. It factors into the overall run differential too.