The flow of designs to be turned into code is relentless, it's almost like a factory.
The reason this doesn't get solved is that you'll always need a developer to smooth the edges, making it responsive, check things work properly everywhere.
There is just too much cruft in the web for full proper automation and there are plenty of frontend developers who barely know how to code but knows how to write React component at a relatively low price.
For individual product companies the effort to create something like this would be too big. Adopting an emergent third party solution instead of throwing frontenders at the problem would be a risky proposition.
Agencies would be the perfect candidate for buying something like this but the cost of developers can easily be passed down to the customer - and if they're big enough to have a lot of clients, they make money because of their brand, not because they're particularly cheap.
I don't think we'll see a solution to this before General Artificial Intelligence; the incentives for building a custom solution for this problem are low and the cost is relatively high.
Maybe if the web as we know were to become simpler / standardised (imagine having native views with native components configured by web services, instead of the wild west of an html page) this could become doable.