I've also seen Vince get "testy" at times with the endless questions. Reading between the lines, I think the 5lb minimum trigger pull is what keeps people honest in IPSC. You really can't do much internal work with such a high limitation, and trying to change major parts is too obivous.
I'd also think IPSC should impose a 10 round limit, but Vince already has a battle over his idea of a 15 round limit. I'd hate to be in his shoes coz he's gonna get hammered no matter what.