I read an article recently that put forth the same thesis, namely: the rise of social media, instagram and filters have flattened the concept of beauty. So many people are chasing the same beauty standards (Karadshian/Jenner, Emily Ratajkowski, Olivia Rodrigo, etc.), and getting the same cosmetic procedures, and therefore converging on a similar look as the standard. It also claimed that it had distorted the dating market, in that guys in small town Iowa are not the only ones competing for the hometown beauty queen; she's getting offers to be flown out by, for example, Miami influencers. Like most 'just so' stories, it's overdetermined, but was interesting nonetheless. Here's an article from a few years ago discussing the converging beauty standards theory:
https://www.the-independent.com/life-style/beauty-features-same-face-instagram-b2534111.html