Interesting idea, but look too complicated for me. What if there are 1000 places where an element can be dropped? What if we select and drag several elements at a time?

Also this approach seems to introduce new complicated concepts like "composables" and even a DSL. Probably writing custom code for Drag-and-drop would be easier that figuring out how this works. I read the page and did not understand much. For example, this phrase is difficult to understand: "Rather than programming all that visual behavior directly, you simply say, for each element you want to make draggable, which future states of your application dragging it should lead to.". Not "simply" at all. Writing new code would be easier especially with LLM.