I actually do kind of like how *neither of them* used their best arguments. Both got impatient, angry and / defensive and dropped into accusations or demands. That's very human, and I like that, to an extent. (Both seemed, at times, to be talking past the other one, busy making their own point, while dismissing the others points, right or wrong.)
It may not be pretty, but it's all too common when people are involved. As long as it is a step in a journey, that *eventually* leads to some kind of reconciliation or at least detente, it's all good. There's gotta be challenge and conflict, and even disagreement. Logan spent *years* pretty much at Scott's throat, undercutting him, playing the Lancer to Scott's Leader, and it took them ages to find a place of mutual respect for their very different ways of doing things. Magneto and Xavier similarly took a *long* time before they could sit at the same table.
If comics stopped being written today, and there was never any followup to this last conversation between Storm and Xavier, yes, that would be a sucky way to close things out. But I think we all know, barring a sudden meteor impact obliterating all life on the planet, the story of these characters is not over...