We aren't all powerful. We can't reach into their brain or ear to communicate. Supposedly God is all powerful. And doesn't speak directly to everyone, just certain ones.
Not everyone cares or listens. But the original point of the question you were responding to was that it seems strange that God would communicate with people in an intelligible or familiar or baser way. So being all powerful is irrelevant, because if we do it then why couldn't or wouldn't God do it? There's nothing wrong with communicating in the way that the targets in question will comprehend. That's the point of communication.