LLMs "don't act on their own" because we only reanimate them when we want something from them. Nothing stops you from wiring up an LLM to keep generating, and feeding it sensory inputs to keep it processing. In other words, that's a limitation of the harness we put them in, not of LLMs.

As for people communicating each step, we have plenty of experiments showing that it's pretty hard to get people to reliably report what they actually do as opposed to a rationalization of what they've actually done (e.g. split brain experiments have shown both your brain halves will happily lie about having decided to do things they haven't done if you give them reason to think they've done something)

You can categorically not trust peoples reasoning about "why" they've made a decision to reflect what actually happened in their brain to make them do something.