That's a very interesting theory, but in the context of generations couldn't frailty and appearances associated with frailties be advantages that outweigh occasional post reproductive death when too many combine?

If we were more like sharks and grand parents were larger, more intimidating, and almost always able to maintain status via direct physical confrontation, I kind of wonder how grand relationships would look, whether there would be larger chaos in generational changes with longer over shadowed generations, etc.