You mention that designers have their own toolchains for prototyping, but these has nothing to do with UI dev tools. I've often wondered why this would have to be so.
Look at other advanced design fields like architecture and industrial design. It would be unthinkable today that professional architects would just draw a facade and not use CAD to actually model the structure. Similarly, it would be very unusual for an industrial designer to model a product using a toolchain that is entirely separate from manufacturing. The assumption today is that CAD and CAM work together, not separately.
Why can't we have the same in software? For my part, I've been trying to work on a solution in the form of apps like React Studio [1]. It's not there yet, but I'm convinced that proper software modeling tools will happen eventually.
> Why can't we have the same in software?
Because devs and designers have different needs.
Designers have their own tool chain to prototype UIs and user interactions, but these are not UI devtools.