It's absolutely possible to do multiple things in parallel using Promises/A(+) then "resolve" a new promise once they're all done. That's what Q.all() in the Q

It's absolutely possible to do multiple things in parallel using Promises/A(+) then "resolve" a new promise once they're all done. That's what Q.all() in the Q library does, for example. That API isn't written into the Promises/A+ spec because it doesn't need to be. That spec is the minimal things necessary for multiple promise implementations to be interoperable.