This concept is mind-blowing and could be a huge game changer. The kind of thing that makes you wonder why no one did this sooner. One thing Illustrator does that is occasionally useful is filling an unenclosed shape based on where the two end points are. So if you wanted a square with a stroke on three sides, this is how you could do it. Since Figma approaches stroke and fill differently, would there still be away to selectively stroke certain paths of a shape?
Also, aligning stroke to the inside or outside of a path in compound paths in Illustrator can be infuriating. How does Figma approach “inside” and “outside” with regard to paths, and how does Figma deal with live compound paths generally?