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I think that's in play either way--people need to tell or be told that their idea is actually technically challenging, unusually insightful into business or users, etc. Critics are silenced because there must be no way they've read patio11 if they're posting, etc. Capacity for mutually appreciative disagreement is low on HN.

The average business is not brilliant and yet is still not easy to execute long enough to succeed. Life is hard.