Long daggerboards are more efficient by having a higher aspect ratio, which reduces tip losses. According to Frank Bethwaite, pointing ability is a function of efficiency (lift to drag ratio).

Similarly, unirigs can point higher because of their higher aspect ratio mains. (A jib makes the sail plan wider, but no taller, reducing aspect ratio.)

Boardless boats, such as the Hobie 16 are the ultimate in low aspect ratio centerboards, using the hulls as boards. On these boats, the mast is typically raked to load up the rudders because the rudders are much higher aspect ratio than the lifting hulls, and therefore much more efficient lifting devices. To transfer as much load as possible to the more efficient rudders, you must rake the rig as much as possible.