I don't understand this at all. If you beat someone in the head-to-head matchups, particularly if there's a home and home, then you're the better team and deserve the higher seed.
Does this mean that if an 18-4 beats a 20-2 team twice they should get the seed? No, because the overall performance throughout the season of the 20-2 team was better. I know we are talking about tie-breakers, but the logic is the same with points differential, imo.
Obviously the answer is no. The most important thing is overall win/loss record. The number of points a team wins by is, frankly, insignificant in my opinion. And I realize that's just my opinion.
If the BBs are going to keep point differential as the tiebreaker, then I think it's pretty important that they implement a "run up the score" option.