Conflating negativity/criticism/pessimism with intelligence. Making a declaration about viability of software based on its present state (youtube will never work they'll get sued), (bitcoin will never work because it can't scale), instead of predicting the viability of a future iteration of it. Nitpicking someone's communication/word choice/edge case instead of focusing out what they were trying to convey
You just summed up maybe two-thirds of the comments on HN.
Re: Ask HN: What are some common traps that smart people fall into?
#41Wrong. More like two-fifths.