I agree that a large number appear to follow similar designs, however i think some of those flipper designs could be improved, still to that end a large number of those units are made to operate on both sides, not leaving a clear side to be flipped onto, so perhaps a whirling buzz saw will still remain the champ just on the fact your flipper arm means nothing when it get cut off,
now a sell righting buzz saw, i see that as being on the right path,