I won't say it didn't cross my mind. But if you're arguing that everything should have been obvious, that was far from the case. People have very different, shockingly different, way-more-different-than-you'd-expect assumptions about things that seem obvious to you (i.e. any one of us); since our job is to serve the community as a whole, we can't just go by our own. It's a constant struggle.

HN is large enough that if the outcome had been wildly different, other users would be thinking that had been obvious all along, and telling us so.

Keep in mind that the important question was how the community would react, and complex social systems aren't straightforwardly predictable. I've been working with HN for years now, and a participant for years before that, and much of it remains counterintuitive to me.