I'm not sure what you're getting at, can you expand?

I work a lot with databases, so say you're trying to write an object and its children in some sort of one-to-many relationship to the DB.

You can write a Promise chain like

  startTransaction()
  .then(() => writeParent())
  .then((children) =>
    Promise.all(children.map((child) =>
      writeChild(child)
    ))
  )
  .then(
    // handle success
    endTransaction(),
    // handle error
    cancelTransaction()
  )

What exactly about that isn't "proper error handling"? Can you expand a bit on how this would be handled differently by you, or perhaps what paradigm you're programming in where Promise.all executes a bunch of items that can't all have the same success and error handler?