The culture that exists between companies and founders in YC seems a better measurement of YC's success than the culture that exists inside any one of those companies. They run YC after all, not the companies themselves.
I have seen some difficult divorces between founders (with various combinations of technical and non-technical), and although some might suggest that YC should arbitrate those disputes more proactively, I think their policy of being willing to talk things through but not vote their shares is the right balance for their relationship with the companies.
But YC's success at fostering a positive, supportive culture between companies makes me quite optimistic that they can create a great environment when it's their responsibility.
I have seen some difficult divorces between founders (with various combinations of technical and non-technical), and although some might suggest that YC should arbitrate those disputes more proactively, I think their policy of being willing to talk things through but not vote their shares is the right balance for their relationship with the companies.
But YC's success at fostering a positive, supportive culture between companies makes me quite optimistic that they can create a great environment when it's their responsibility.