Jon has learned to rule and he's good at it, by Sansa's own admission.
Jon earned more loyalty by having young Alyss Karstark and Ned Umber swear fealty to him in the way that he did rather than by Sansa's path. You could hear the lords present that they approved of what he was doing and the way that he did it. And he's leaving Sansa in charge, the sister who openly disagrees with much of what he says, publicly placing trust in her. He's the King that earns loyalty.
And he doesn't need to be told what's best for the realms. He's the only one who knows the true danger of what's north of the Wall - an existential threat to humanity that requires the unity of Man, not just the North. That's the entire plot of the series, not just a localized conflict. People need to to buy what he's slinging, he doesn't need to buy their petty squabbles.