I don't know why newer kpop stans are afraid to listen to older songs.
You don't see young 15 - 16 year old being allergic to P!nk/Britney/Beyonce/Avril/Maroon 5/Coldplay/One Republic older songs, but in KPOP it's like as if they are being forced to listen to older music
And it's not even that old like 2000s old it's like 2010s old
When I saw some 2nd gen MVs for the first time, I seriously though that they were from 80s (It wasn't Wonder Girls)