What is your theory for why 80s cultural artifacts have become mainstream again? 

E.g. music like ABBA, Everyone wants to rule the world, etc; entertainment like Stranger Things, Breakfast Club; fashion like the shades, etc 

Working theory: internet native youths subconsciously yearn for an analog world

My theory: attention spans are lower; creating something new takes "too much" time.

It's easier to find value in the old stuff that nobody knows about to get the same feeling of "creation" without the effort of creating it.

And you get the attention residuals.