I don't know where you are getting the stiffness from. In fact, having ridden both the stock SG GS and SL boards from the same year, the 185 and 163, the 163 felt stiffer because it would not turn on the tail- I think it must be for more snap out of the turn.
With a GS board, you can find a wide blue and lay it over 45* and do hero carves at mach bro, and never worry about the pressure building too much at the bottom of the turn, never worry about outrunning the sidecut, and never worry about the nose darting off the moment you change edges. Not that I feel there is anything wrong with riding in such a manner, but it's not my preference, and I don't think it's very versatile.