Pretty much, I would like to be able to have comment boxes and then arrows coming out of them, to the spot I want to comment on. This is so that when I come back to it later on, I know what I had intended some things to be.
I see some use for it for Marketplace items, where completely different skill levels collide but personally I never had the issue that an organized widget structure and proper naming wasn’t enough to keep things clean. With complex widgets things might get quite intense but I those cases comments would just add another layer of clutter. If at all I think the Widgets should have an little comment icon beside them in case there is a comment to them, and only display if that particular widget is currently selected.