I don't think there is anything that is beneficial to this limb design. All I can say is that I have owned three Hoyt bows, including the new Vipertec and can not complian a bit about the limbs. Its been a long time since I have heard of a Hoyt limb coming apart. I personally feel that Hoyt limb tolerances and quality are one of the best in the industry bar-none.
I'll freely admit, yes I am partial to Hoyt. But I'm also a big fan of a lot of bows I've shot and liked. Just from my experience, Hoyt seems to make a overall better quality bow, including limb than most manufacturers regardless of being split or solid. I know this will stir up some honets.
On note of the risers being ugly? Well come on, they are unique, unlike some other "popular" bows out there that start with a "B" and an "M" who seemed to have copied off one another an awful lot. And yes, the bridge design IMHO does work well. It makes sense that it does in fact stiffen the riser more than conventional designs.
There, that should get the pot a stirren!