Sounds intriguing, but I'm also a little confused about the flow of "code that generates sketch files"... what is the purpose of Sketch in all this?

I would think programs like Sketch are useful in general because they give designers a nice way to design things without adding the extra layers of abstraction that code brings (i.e. they can just draw things with a mouse instead of writing instructions that tell the computer how to draw things). But if Sketch is just another rendering layer of react components, then what is the point of having it... why not just look at the rendering in a web browser?

Or am I misunderstanding and there's a way for react code to be generated from Sketch? (Despite this statement in your blog post: "As the industry has coalesced around Sketch, people have sought to generate code from Sketch. This is exciting, but for our challenges we wanted to do the exact opposite — to keep DLS in sync we have to generate Sketch files from code.")