If the only thing you owe your interlocutor is to use your "prodigious intellect" to restate their own argument in the way that sounds the most convincing to you, maybe you are in fact a terrible listener.
By restating the argument in terms that are most convincing to you, you may already be warping the conclusions of your interlocutor to fit what you want them to be saying. Charity is, "I will assume this person is intelligent and overlook any mistakes in order to try and understand what they are actually communicating." Steelmanning is "I can make their case for them, better than they could."
Of course this is downstream of the core issue, and the reason why steelmanning was invented in the first place. Namely, charity breaks down on the internet. Steelmanning is the more individualistic version of charity. It is the responsibility of people as individuals, not a norm that can be enforced by an institution or community.