One useful aspect of our brains being susceptible to hindsight bias and the narrative fallacy to smooth over the non-linearity of life is that it helps us get on with things. If we didn’t have the capability of smoothing out the big jumps, we’d be standing around awestruck at the technology and changes around us. Instead, we hop into enormous aircrafts without a passing thought to the number of things that had to fall into place before we could do that. And that’s probably a good thing.
They’re also great mechanisms to overcome negative Black Swans, of course. This has been discussed by Dan Gilbert and others, but I think nobody’s looked at how we’d react if we were constantly made aware of the positive Black Swans around us.