Mostly cribbing this info from Bethwaites book, but modern skiff don't seem to bother with rotation because with their sail carrying power and ability to plane upwind and down, and the fact they always use spinnaker off the wind keeps the apparent wind so far forward that there isn't a benefit. They have evolved in simplicity too, with the primary adjuster on the water being the hydraulic cylinder the mast is mounted on controling the sensitivity of the "automatic" upper section, and the outhaul manually controling the lower half. I wouldn't be suprised to see a move that way in cats too, as downwind speeds increase to where in effect the boat feels like its sailing upwind all the time....