> "We want to be sure we’re not discriminating against founders in our funding decisions at YC"
This is not an affirmative action program. YC is an accelerator, not a charity. It primarily seeks long term positive returns, and to do that you have to evaluate people and their ideas based on merit, not their gender. Having more female founders would probably be better for the startup ecosystem as a whole, but "actively preferring" a class of candidates based on attributes poorly correlated with their probability of success would be bad for YC.