“The fan base are responsible for longevity” point needs to go by now. It even sounds stupid when you mention it out loud. It’s widely known Fandom can give good peaks but longevity is out of their hands and it’s even harder on the new chart system. By logic if fanbase is the reason for longevity, all BTS songs will have never left the charts in the first place.
Exactly... and ULs of songs can really point out how big and how wide the reach of the song is. Both these metrics are very important