I'm highly sympathetic to this view, I think that most enticingly, it creates the largest window for novelty and innovation. The draw back is that without truly universal principles, we can only account for local cogency, sensibility (window so big, everything else falls out).
Haven't read all of these newfangled moderns, but I liked how Madoka Magica dealt with it. General principles can be novel, and are generated with particular exemplars, but the principle then retroactively effects the past as if it were present all along, and projects into the future.
Interestingly enough also, this is a theological problem too. One cannot account for a universal savior that shows up at a particular time and place, unless in some sense this reverberates throughout the past, as well as the future.
https://en.wikipedia.org/wiki/Harrowing_of_Hell
Problems with it is that if we want to keep things at the level of the apparent, or physical, then to become exemplary is to follow a certain path, as it were, to reproduce material circumstances, and conditions. The preciser the conditions, the closer the result.
The fusion of is and ought (I like that) is still really reduced to more is, than ought. As unless something were the static maximum, rather than a surpassable, or point along on a path with more road, then it still is just an is, and the ought in the sense of what is better cannot be shown, until it is literally
shown, and then it too, falls to the "is" bin immediately.
Not nearly as well read as you are, just giving my cobbled together perspective, and if it seems like I'm just repeating things I've heard nonsensically like an infant baby person, then just cut me some slack. Gotta start somewhere.