My guess is that the headstock design actually has function in mind. It's elongated somewhat, adding a bit more resonance and sustain and possibly enabling some Fender style behind the nut tricks that you can't really pull off on the usual symmetrical headstock. The staggered tuner positions appear to allow the strings to pass even straighter over the nut than the symmetrical design. It looks to me like the chief goal was to stretch the headstock out a ways without needing either a sharp tilt-back angle or treble string retainers. Being a big fan of the PRS vibrato bridge and the "unobtainium" nut, I'm personally more concerned about how those two changes affect it than the headstock. Vintage-style open bobbin pickups would do more to deliver a vintage sound than either the bridge or the nut, so why mess with one of the most functional bridge-nut combos ever devised?