Indeed - plus when people link comments as topics it confuses the hell out of me.
Your last line hits the nail on the head - It's an impossibility for YC to give a detailed rejection to everyone, it's also impossible to second guess why you might have got rejected (if you could, you'd have most likely rejected the idea yourself).
Rejection sucks - in this circumstance, the best thing for the OP to do is - take a deep breath - (try to) do a rational 360 degree on themselves, their team and their idea - and move on/forward/upwards.
Your last line hits the nail on the head - It's an impossibility for YC to give a detailed rejection to everyone, it's also impossible to second guess why you might have got rejected (if you could, you'd have most likely rejected the idea yourself).
Rejection sucks - in this circumstance, the best thing for the OP to do is - take a deep breath - (try to) do a rational 360 degree on themselves, their team and their idea - and move on/forward/upwards.