why are crossfitters ripped? I am looking for a science based answer :)

I got into a debate with a bro at my gym, he said I should be lifting less weight, higher reps, squatting to just above parallel, etc. blah, blah, blah...

Anyways, he did get me thinking with the higher reps, why are crossfitters so lean?

is it genetics? are they actually lifting enough to build myogenic/neurogenic tone?   any response is welcome, but I really want understand the science behind it.

I don't plan on changing my routine anytime soon, but is there benefit, in high rep, moderate load work?

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