This is the first time I've seen people accuse AI text of being "too structured and consistent" compared to human text. Usually it's about specific patterns or tons of repetition or outright mistakes.

AI was trained on human writing.

> guess humans will eventually also start writing more like the AIs they learn from.

With the AI feedback loop being so fast and tight for some tasks, the focus moves on to delivery than learning. There is no incentive, space or time for learning.