Yeah jrock/visual kei bands were popular in mid 90's to mid 20's, in the present time it's kpop that is dominating with BTS at the helm! I can't blame kids nowadays (It's just part of one's generation, but 90's was DOPE : )!
Probably from experience, even though I haven't really got to big stage performance, it's just different when your hearing it live (is what I think) :
I've slightly more controversial opinion, I think most people who think they "like" this music is just opinion they formed to be part of the "herd" around them. Otherwise they would be immediately pointed out as "they don't know good music".
Whats funny is most people can barely understand lyrics of the popular songs when they hear it first couple of times but they still pretend to be into them, eventually they do get hold of them but till then that song already becomes part of them. lol
I think it would be better to find ways to know whats trending or good song than just depending on what kids are listening on YT, which is usually also controlled by YT and other similar social media algorithms, as a content creator myself, I can say with certain level of certainty that it has heavy weight on what's pushed and whats not from get go.
Its kind of sad really. If we really have to find what's popular then we should really go back to old method of finding out how many attend the live shows, just think about it, in 90's there was really no real advertising other than what record companies were doing for the bands but they still made it big, now anyone who knows bit of SEO can drive the crowd and even completely reform the crowds taste if they are given incentives for it. Its like making "cigarettes" cool and symbolism of man's dominance so women in early 20th century would buy them thinking they are now breaking walls and fighting for "equal rights", no jokes, that actually did happen in US and is one of the pivotal case studies in marketing and its apparent misuse. haha
And things are only LOT worse since anyone can do that now, I wonder if we removed that mask, how many truly popular things now will still be categorised like that.