The AI Fermi Paradox: If "humans can write like this", then why haven't they?

Whenever I hear someone argue that it's impossible to detect AI-generated writing because "AI is just copying human writing" -- a disproven myth, by the way -- or "humans write like this all the time", I often think of the Fermi paradox. The Fermi paradox, named for physicist Enrico Fermi, is an observation about aliens: the universe is unfathomably vast, and has existed for an equally…