This maneuver of course is all about converting potential energy (altitude) into kinetic energy (motion) by wasting it at the stress limits of the airframe. AoA gives lift which is wasted to the side as well as induced drag which wastes energy in the form of wingtip vortices as mentioned. The added value of a slip or knife edge is you get the rudder adding to it through unused yaw and associated drag, while it angles the fuselage to get form drag as well. All this challenges the structures, but I used to see minus 5,000 fpm in the C182 without speed brakes or evidence of any rivet stress. Fly-by-wire may be why they do not use it as much in military jets. I am guessing, but you guys would know.