I mean that's fine. The numbers say the majority of QBs under 6'2" won't be good. The reality is that you may have missed out on Drew Brees.
You can either use it or don't.
I believe that each player should be evaluated for what he is, not by prototype H/W/S standards. I think you miss a lot of good players by pigeon-holing yourself like that.
To each his own.