Society is rapidly becoming culturally monolithic. Distinct subcultures are becoming a thing of the past and you have a monolithic normie culture that absorbs the most superficial aspects of subcultures and filters out anything of substance from that subculture. We've all seen this happen with looksmaxxing. This has happened with things like "goth" and "emo" as well. I was never a goth or emo but I knew people who were, so I know enough to know it's more than just hairstyles and clothes. But that's all they are now, just aesthetics.
Distinct subcultures are a relic of a pre-terminally online society. They were the result of geographical location, isolation from mainstream culture, and people with a common genuine interest in something. People became a part of a subculture because there were a lot of members of that subculture in their local area and they made friends with people who introduced them to it. But now everyone is a terminally online introvert, who gets all of their opinions, interests and lingo from the internet, so geographical location is no longer a factor. And since almost everyone spends all their time on the same sites (Reddit, tik-tok, instagram) you're seeing more "sameness" across the general population.