In general it will match the language style you use.

If you ask a sophisticated question (lots of clauses, college reading level or above) it will respond in kind.

You are basically moving where the generation happens in the latent space. By asking in a sophisticated way you are moving the latent space away from say children's books and towards say PhD dissertations.

I don’t find this to be true at all. You can ask it in text speech with typos and then append how you’d like the response to be phrased and it will follow the instructions.

Yeah, because you told it explicitly how you would like the response to be phrased, which is the same thing you’re doing implicitly when you simply talk to it in a certain way.

Come on, this is human behavior 101, y’all.