While I completely agree YC is providing valuable advice, I do not find your argument convincing. It reminds me of realtors supposedly being aligned with home owners because they make more for a higher sale price, which is true but it's completely ignoring effort. The homeowner has a much higher incentive to put more effort into selling the home for the right price, whereas the realtor has much more incentive to sell it faster.
This is not a perfect analogy for investors and founders, but it is an example where supposedly incentives are aligned but in reality they might not be. What's best for the investor is not necessarily what's best for the founder.
But again, in this case I do agree that YC is providing useful advice.
I hear what you're saying, and that makes sense, but in this case YC has no incentive to "churn and burn" through companies. In fact, given that they _really_ make their money from multi-billion dollar exits, even a marginal amount of dilution in those companies harms them greatly.
https://www.youtube.com/watch?v=pbFkw_roJqI
This is not a perfect analogy for investors and founders, but it is an example where supposedly incentives are aligned but in reality they might not be. What's best for the investor is not necessarily what's best for the founder.
But again, in this case I do agree that YC is providing useful advice.