I think this gets at the related, but distinct, idea of the intellectual Turing test. The idea there is to present your opponent's argument in such a way that t

I think this gets at the related, but distinct, idea of the intellectual Turing test. The idea there is to present your opponent's argument in such a way that they can't tell if the argument came from you or someone on their side. If you can do that you have some assurance that you actually understand the argument they are making. You're right that steelmanning is a bit different in that you're trying to formulate the argument in a way that is most convincing to you. That may not necessarily be the argument that is most convincing to your opponent.