If your group is talented & strong enough to continue putting out hit after hit (and you're actually the ones producing, composing, writing), THAT'S the sign of a strong successful group. I just don't think the debut song matters that much.
My fav 4th gen group has one of the biggest, most complex discographies out there for 4th gens but it doesn't change the fact that I'm not a huge fan of their debut song. I think IVE might have actually had the best debut song with Eleven. Didn't TXT have a really popular debut? And Dalla Dalla was good too.
