I think that is part of the point. You want to do things that make it obvious when the runtime structure has gotten arbitrarily nested. Closure callbacks actually help there, since they make it someone visible and easy to "smell."
That is, if you have the same nesting at runtime, but it is just somewhat obscured by the naming style that you did, that sounds problematic to me. Ideally, you find structural ways to get rid of that nesting. (I said elsewhere that I'm a huge fan of first class queues. There are other options. Callbacks are one. And realistically, what you describe is an option, too. None of them are intrinsically bad.)
