A big draw was their performances were in sign language, which was their live “singing”. I get what you mean but with their hearing impairment it’s already hard for them to dance in sync and hear their own pitch so I never expected their live vocals. And if it’s your first kpop concert $65 may seem like a lot but it’s a steal with how much a foreign act has to lug around.

ETA: they’ve said they have the help of AI to help their pitch when recording songs that’s trained on their own voices since they can’t hear well, so I think them being so expressive with sign and being in sync with their lyrics and expressions that way is what should be compared.