The flyweight category is to rowing as go-karts are to NASCAR. It's kind of the same thing. Just much worse. Why take a sport where you can go fast, and make it slower?
Attitude, desire, thrust to weight of the rowers (ie weight adjusting), and boat unity are probably more important than perfect technique regarding boat speed.
Seat racing depends on all involved pulling equally for each rower being evaluated...not alway the case, I've seen plenty of petty personality conflicts come into play.