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I'm not sure "product person" was the right choice of words for what Carmack is trying to say. It seems to me that the distinction he's drawing between managers and programmers is one of precise communication skills. The most talented programmers (and the best product managers - which is maybe what he was getting at) are talented because of their ability to communicate precisely - currently, that means communicating between stakeholders and computers. In the future, it will mean communicating precisely between stakeholders and AI tools. But the fundamental demand for people with a knack for precise communication is not going anywhere.