Very interesting. Millenials are also the most congenial generation, all social engagement is "nice". Our personalities (not just on twitter) are being homogenized as well. Conformity was a prime virtue of the bourgeoisie, it's odd that it's the only one we carried over (and not say, propriety or noblesse oblige).
It's a great article, but to me, the article does not illustrate a "trend". Rather it illustrates what has been occurring, well, for 150 years. Essentially, the commodification of everything (truly everything, there is no end in sight). This is modernity playing out, on the same track, in the same direction as it has since the 1800s.
This is why, imho, modernity was already fully understood by the 70s. This was the last generation who had still somewhat of a living memory of life outside consumer culture, of living outside the framework where daily experience is mediated by things circulating in a global market. Ellul, Baudrillard, Debord, McLuhan, Mumford, Lasch, ... all were describing "blanding" processes (to use the terminology of the article).
Sorry to continue on and hijacking this, it truly is absolutely fascinating. The effect must be even worse in the new upcoming countries. They have much less has a physical anchor than the west has.
To your point though, note also that current pop-phychology/philosophy is no longer a mash-up of Marx and Freud, which it certainly still was post WW2. I think this would help explain why we're living in "a-historical" times, as both very deeply cared about grounding thought into historical time (generally western history, nonetheless, something we no longer do).