To address your point specifically though, Webflow is (at least from my perspective) the inevitable result of the line of thinking you're pursuing. So I'd be curious what you think of Figma vs. Webflow, and why those two products have their relative market positions.

I.e., "Tool A, used to design for technology B, doesn't output files in technology B format. [...] doesn't make much sense".

E.g., why not just use Webflow then? From my understanding, that's what it does, that's what it's made for.