That is a different methods of analysis, not just a hunch (and most hunches are very good, but sometimes they're way off and the calculations method can perform better.)
Everyone knows whether a team is good, "reasonable" or just sucks, but injuries will define the final standings more than any other factors (a lot of trades will still happen, and that also changes a lot). The Celtics could go "somewhat reasonably" end up having from 15 to 45+ wins, (with a number under 35 being more likely,) depending on trades and injuries in the Celtics and in other teams.