I mean, am I mistaken? Is the UI more complex than it looks or something? I'm just basing my comment off what I've been able to find through your reference.
If there is some new system that's a genuine improvement over React and kin I'd love to know about it.
Generally speaking, simple UI sounds like something to aim for. If your UI is "intrinsically difficult", there's a high risk the user will conclude the same thing.
Not intrinsically difficult to use, I mean that the problems involved in implementing some ui concept may be intrinsically difficult or not (this can happen even when from the user's perspective the UI is simple/elegant). When they are, then you need appropriate tools.
And yes absolutely as I’ve said, if it’s possible to for some domain to have a basic ui do that.
If there is some new system that's a genuine improvement over React and kin I'd love to know about it.