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> How many times have you written code along the lines of "if this isn't null do this, otherwise return. If the result of that isn't null, do this, otherwise return" etc etc.

Yeah that sucks, but why would you write it that way. I thought it is common to write "if this is null return, anyways: do this, do that."

> Promises are essential to async Exceptions

I don't see that either. If errors are specific to functions then there is only one case where I handle them, so it doesn't save something to put these checks elsewhere. If they can be accumulated over many calls, then they should be just part of the object state (like feof), so I can query them in the end.