Even humans don't start a chain of action without some input. Interaction is not the only form of input for us. What you hear, what you see, what you touch and feel. What you smell. All forms of input that inspire action in us. How would a person behave if he was strolled of all input? I suspect not far off from how LLMs currently are. Anyway streams of input is fairly non trivial especially when LLMs are grounded in the physical world.