The thing, or reason I like a “selfie” is that I have too many facial expressions, and a large percentage of them are not flattering! So the odds of someone else taking a picture of me that I like, are pretty slim. Over course of my life, maybe five pictures taken by others are close to acceptable. One of them I gave to my grandmother one time, and she said, “thank God a decent picture of you!”
So the reasons for the age of the selfie do not need to be that complicated. I believe too many read too much into it. The only reason the age of tech is the age of the selfie, is because we can.