I feel like maybe around 2012 the whole concept of eras died.
Like I can clearly visualize items/people/media from the 60s/70s/80s/90s/00’s, but everything is homogenized now and there’s really no “style of the time” either. I think everything from 2013+ will just be remembered as a malaise era, if anything. Maybe the style of the 2050’s will be post cyberpunk apocalyptic? I have no idea.
I think you’re wrong because there were things unique to those decades, but I think what makes your argument hold weight is that not everyone would agree what was the most relevant, especially depending on what social niche you were apart of.
Post 00s, we have a lot of subcultures and much less of a monoculture for nations as a whole, so you could have, say, a 00s or 10s Anime/Game cosplay night, but if you ask everyone to wear “average clothes for the time” there would be no predictable pattern.
The subculture is a good point. I would not have been paying close enough attention to those to really appreciate their nuances.