I'd argue that the people using AI most effectively are in the mostly-chatters group that the author defines, and specifically they are using the AI to understand the domain on a deeper level. The "power users" are heading for a dead end, they will arrive as soon as AI is capable of figuring out what is actually valuable to people in the given domain, not generally a difficult problem to solve. These power users will eventually be outclassed by AIs that can self-navigate. But I would argue that a human that has a rich understanding of the domain will still beat self-navigating AI for a long time to come.