If YC is in the business of matching cofounders, I am unaware of it.

Without that, you're still suggesting that they fund a team that is so uninspired that they can't spend a little time on the application. YC does not have unlimited resources with which to filter applicants, so increasing the number of applicants and decreasing their average quality (an argument that this wouldn't happen would be interesting if you have one) seems like a lose-lose situation.