To those who think this list will help them get into YC, or lament "why didn't I get into YC when my idea was squarely on this list":
The YC application is a sales pitch, and you're not selling your idea, you're primarily selling your charisma and capacity to spin vision and sell. Second, you're selling your chemistry with your cofounders and stability of your relationship. Third, you're selling your capacity to build, at least some usable prototype, but this a low bar.
At no point are you actually selling the concrete idea, unless you're doing something extremely specific that seems valuable and you're one of the few who can build it. For the rest, the idea is a rhetorical vehicle to sell the other things.
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