Recently I have been charged with helping someone setup paperwork for their startup. I am not a lawyer so I simply have the paperwork, standard agreements, and general company structure that any lawyer would (I assume) give away for free. Avodocs has pretty much all that paperwork covered, carta has the captable, and pilot has the books under wrap. After reading this article I'm somewhat torn about mentioning things like c corps and filing in Delaware to my friend since in the end it really is only the product that matters. Corporate structure steeped in law/history is a hackable test which everyone must take...resulting in either getting bitten or by running to attorneys and tax advisors (because they were bitten in the past).
TLDR opinion. The hackable c corp structure Y pushes has payed off well for Ycombinator yet it is the very thing that can distract from building a good product.
Then again I'm sure someone might make the claim that c corps are also a way to easily share equity with your employees.