I think the issue you're bringing up is valid but is just a dark-side of VC in general than just a problem with YC.
Startups and VCs tend to bang on about community values a whole lot more than they actually care, if at all, in contrast, big corps at least don't pretend as much, though it seems like that is changing with recent shift of marketing trends.
I think the "problem with YC", and in a larger perspective SV, these days is quite specific. What makes, or made, these environments different is that they weren't made for geniuses so much as taking overall average people with an interest in technology and giving them the opportunity to use that interest to build something new instead of it getting lost at some random corporate job. The same way a new music scene isn't usually made up of child music prodigies. But now they are seemingly moving away from that.
