Interesting to see how long even the industry insiders failed to take YC seriously. And then once it was working, they flipped immediately to complaining that YC was too powerful and too influential (unbeatable network effect, seed/A valuation inflation, and so on).
I also remember the constant naysaying about scalability and batch size. Our batch was ~19 companies. People kept naysaying, "Well this model is fine for now, but it will never work past 20 teams."
PG would always reply with something like, "Yeah, they said that when we had fewer than 10 teams also. We aren't thinking too far ahead; each batch, we just find the next bottleneck and solve it, and we'll see how far that gets us." Which evidently got them pretty far. A lovely example of doing things that don't scale.