so really it comes down to core design and how well made the cap is as well as how thick the edge material is. I notice a huge difference between our handmade customs and the run of the mill boards in edge thickness. the metal edge on my garage is easily 2.5 times thicker than the edges on the dynastar legend I had. 3+ base grinds vs maybe one. thats gotta have more effect on board strength than a core thats radiused on the top edge.
I am no engineer but I like to think I can objectively look at the physics of something. having a flat sheet of fiber (triaxial lets say) lined up against something that has at least one bend in it or a radiused curve, the bent piece should be stronger and certainly stiffer(ie the above mentioned livliness)
I can see the cracked edge thing being a weak point but epoxy will seal a crack on a cap as easily as it does a crack on a sandwhich.