Later in that sense isn't usually very useful, since if the promise isn't resolved, there's no new information about the state of the system. Where I think prom

Later in that sense isn't usually very useful, since if the promise isn't resolved, there's no new information about the state of the system. Where I think promises help is that they allow to express the concept of "do stuff later" in a cleaner, more extensible way. It's really just about having a nicer interface (you can even ask it questions like, "what's been done?"). But the part where you decide what the promise will do after you specify what it's a promise for isn't, in my view, an important detail.