[erikpukinskis]

I would have to look at your code, but generally if you have a long callback chain and you're trying to propagate errors up it you are doing something wrong. Are you really working on 10 nested activities simultaneously, or are you just nesting things because it's convenient and you don't want to think about how to do things in stages?

If you're trying to convince me that "callbacks become painful in situation X" you really don't need to. I know that. What I'm saying is that 9 times out of 10, the answer to the question "do we really want to be in situation X in the first place?" is "no". But instead of getting out of a bad situation by refactoring, people just write crazier and crazier control structures (i.e. promises) to make those bad situations workable.