Just think about this.
If you made a list of the top ten boy groups in K-Pop history, it would ONLY be boy groups from the first 3 generations.
Honestly, if you even expanded it to 20, I think it would still be only boy groups from the first 3 gens.
What happened?
Arguably the most successful 4th gen group is Stray Kids, but they're practically nugu in Korea, and they certainly couldn't hold a candle to peak Exo, Wanna One and obviously BTS.
Honestly 4th generation will be defined by its girl groups.
When we try to chronicle this chapter in the K-Pop lore, we will start and finish with dialogue about the unprecedented dominance of multiple girl groups. And then as a footnote we'll go "oh yeah there were some boy groups too, I guess"
We've never seen a generation of male idols have less impact and relevance both culturally and statistically.
And the crazy thing is that it's unique to 4th gen, as 5th Gen is already showing signs of debuting future superstar boy groups, even virtual ones.
What happened?