It seems to be called the Rule of 3. see https://en.wikipedia.org/wiki/Rule_of_three_(writing)

Like Caesar's supposed "Veni Vidi Vici" saying, people seem to prefer and remember items when grouped in three.

I recall a public speaking film shown to my management science class starring John Cleese mentioning this rule of 3.

Given that this specific style is the result of being reinforced over and over again via RLHF, "inadvertently" isn't really the word I'd use.

> did we inadvertently train AIs on idiotspeak.

Nope! That is - training on lowest-common-denominator, low-signal high-noise "idiotspeak" was not at all inadvertent.

In-advert-ently?

It's engaging and I doubt it happened by accident.