I think the trouble w/ this is that it doesn't account for a particular team's strengths.
The Celtics are not a good rebounding team. They wouldn't be even if they sent 5 guys to crash the glass. They also aren't a very good offensive team. Even if they get an extra possession,
the chances they'll score aren't necessarily all that high.
They are, however, a very good defensive team. They actually generate a lot of points off of their defense. So it makes sense to get back and get the defense set. For a team like the Celtics, you probably have a better chance to generate turnovers and gets points in transition that way, rather than sending Brandon Bass and KG to crash the glass.
Against the bigger and / or younger teams, chances are the Celtics will fail to secure the offensive rebound and the other team will race down the court and get an easy bucket. Or even if they get the offensive rebound, they'll fail to turn it into points because they don't have any good inside scorers, and they're not a very good offensive team in general.
For most teams though, this makes good sense. If you have bigs who can effectively crash the glass, and your likelihood of stopping your opponent if you get your defense set is not as high, then trying to generate extra offensive possessions makes sense.