Consider the amount of compute needed to beat the strongest chess grandmaster that humanity has ever produced, pretty much 100% of the time: a tiny speck of silicon powered by a small battery. That is not what a species limited by cognitive scaling laws looks like.
Humans are capable of logical reasoning from first principles. You can fool some of the people all of the time, but no words are sufficient to convince people capable of reasoning to do things that are clearly not in their own self interest.
Given we seem to have a decent range of persuasiveness even amongst these very very similar minds, why do you think the upper limit for persuasiveness is a charismatic human?
Though even if that WAS the limit I'd still be somewhat worried due to the possibility of that persuasiveness being used at far greater scale than a human could do...
Because there's a hard limit on how much people can be made to act against their own self interest.
Generative AI creating text/audio/video with a goal and a testing/feedback loop. I'm not an AI and I think I could make it work given a small amount of resources.
Sure, there's an aspect of understanding the other person, but chaos theory doesn't stop politicians from obtaining and keeping power.
You need to be able to predict how people will react to your words.
I think you're imagining some mastermind that has to get everything right or it dies, instead of a master politician or businessperson who's a few percentage points better than the existing competition and for whom the advantage compounds. Yes, Less Wrong is way too hysterical about everything, but charisma that's better than human is a problem.
You're missing that intelligence is like magic, and enough of it will allow AI to break the laws of physics, mathematics and computation, apparently.