"The studies center on the thesis that the human hand, with its relatively delicate fingers, long thumbs, and short palms, may have been driven into its strange shape by fighting between males."
"A fist allows for twice the force of an open-palmed slap before bones begin to break."
Consider me a skeptic, having seen many boxers fractures in ERs. I thought punching without wraps was a pretty easy way to break your hand if you didn't have great accuracy or were just unlucky with angles. Palm/open handed strikes seem a whole lot safer. Seems like a silly reason to develop a hand shape.