It is typically MORE noticeable and valuable on larger screens than it is on smaller screens. When it first came to the iPad it was more noticeable on the 12.9” than the 11”.For sure— I use all of the aforementioned devices. The experience is a solid step up (and clearly a lot tougher for some to go without than others). I wonder if the desktop Mac experience would benefit as much as smaller screens do.
I am just not aware of a professional use case for it that would make it something Apple would want to bring to the display. Like you said, high frame rate footage could be one application. Though I would guess professional use cases will increase as technology moves forward…
ProMotion isn’t about use cases. It’s just about being a nicer experience. If Apple brings it to a “pro” display it will just be because it’s a better experience, not because of it being specifically for some particular creative use case.