I know a lot of millennials and my impression is that most are happy in their skins, or are becoming that way. Of course that often has to do with social class and/or other social pressure.
It's amusing how many middle aged people are completely out of contact with millennials, who they often disparage.
The wedding photos they value the most are made by friends with phones (or with digital cameras). Those images are rarely retouched. Photos are, for most people, recollections more than documents. Professional wedding photographers have mostly served people's belief that photos are important to the wedding. But recollections are soft and moving and anything more becomes irrelevant...the marriage evolves or devolves or evolves and devolves and evolves into some sweeter alternative.