Depends on what you're trying to achieve. If you're looking for insights on yourself: then being asked a question, to have the answer you gave fed back to you with a pretense of insightfulness will easily be outcompeted by staring at a mirror for 10 minutes. If you're trying to generate complementary group dynamics: sort people by interests and spread them out.

If you're trying to generate efficient groups: sort people by interests and don't spread them out. Literally the worst kind of systematising will go toe-to-toe with MB.