But the other points, correct me if I'm wrong, but it basically sounds like you are saying "AMP forces our content across publishers to be consistent, and it has a structure that makes sure advertisements don't block page loading." As a web publisher, though, surely Conde Nast has control over the layout of its content. And as a web publisher, it is part of Conde Nast's job to make sure the content loads quickly and that the ads do not block page loading. At the risk of sounding aggressive, your reasons sound like "AMP enables us to outsource all the hard parts of our job."
As to the experience benefits are ads loading more smoothly, as a user, is an experience benefit. Technically. Except that, as a user, ads substantially decrease my experience. I get that Conde Nast exists to make money, that I don't want to pay money for the privilege, and that we are fundamentally at odds here. But attempting to sell faster loading of ads to me in the guise of improving my user experience feels somewhat disingenuous.