But even that is grossly inefficient.

Let's say I'm making an HN comment. I have a one-sentence idea, I get an LLM to expand it into an impressive-looking (or oppressive-looking) wall of text, and then I post that. Well, let's say 10 people see it. And each one of them has to either plow through it on their own, or paste it into LLM to get the summary.

But even with one-to-one communication, it's still terrible, as you say. You can't be bothered to clarify your idea, but you're trying to use an LLM to make up for your lack of thought? So you're going to make me plow through that huge blob of text to try to understand what your thought was, the thought that you couldn't bother to actually really think through. That's far less efficient than you, the sender, actually doing the thinking.

But it lets the sender be lazy. And the sender is the one in control.