That's the problem of whether the developer and the user have the same expectation of the max duration or timeout of an action. For example a developer might default all backend actions to have a timeout of 30 seconds. But as a user, if the action succeeds quickly (the usual case) I want to immediately see a confirmation of that. I don't want to wait 30 seconds just to see no notification about any failure.
But that's less a problem with getting notified or not, and more a problem with software not doing what you've told it to do.