YC isn't about building romantic relationships, it's about building companies. Mixing business and romance is a losing proposition for women, because the latter taints absolutely everything. One of the awesome things about being a guy is that I can look around at, e.g., my classmates from grad school, and be quite sure that their "mental file" of me has a lot more about my intellect and character than about my looks. If someone has my back in an argument about what our team should do, I can comfortably assume it's because they respect my position, not because they're romantically interested in me. These are things men can take for granted that women cannot. And when you allow romantic advances in professional contexts, you make it all that much harder.
I'm actually pro this blanket cover, but I just see it as band-aid with pretty unclear non-business related consequences.
As for you argument, I'm considering looks an asset to be employed alongside intellect, presentation/communication skills. I mean, I wouldn't want to live in a business enviroment where we're assigned numbers as our names, modulate our voices to sound the same, and use same unisex avatars in a VR-powered business conference all the time. Would you? That would alleviate all possible business-related concerns of yours.
