I think the last one is by far the biggest reason for why this happens way less in humans. In every conversation, almost for every sentence, people gauge the response their words have on whoever is listening. If something didn't land as expected (frown, confusion, unpredicted response) you unconsciously adapt and try something slightly different.

It's immediately obvious by the fact that you're clearly using way different ways of speaking (tone, speed, vocabulary) when you're speaking with a friend, versus your parents, your colleagues, people you don't know, children, etc.