> I'm a fan of the improved UX harmonization across form factors.

Don't understand why. A ~6" phone screen and a 3x1440p setup have little in common regarding what "effective" UX looks like. Unifying them for the sake of consistency risks making both worse.

Absolutely, scalable UX is a hard problem, and it's taken Apple nearly two decades to get to this point. But to be able to learn a "Control Center pattern" (for example) and apply that across desktop, tablet, phone, HMDs and TV UXs has real benefits for ordinary users.