I've had some similar thoughts, I find it super fascinating how easy it is for most people to identify AI writing.

In the past two decades of CG etc. untold numbers of words have been spilt on the subject of the Uncanny Valley and you always get this explanation of how the brain has dedicated pattern matching circuitry and can easily flag when faces feel "off".

How interesting that the same is true for language. Turns out we're not just visual-heavy animals, but also very symbolic ones.