In reply to only facts.

Well, you are very misinformed.
They have 4 rappers & 3 lead vocalist which all can sing. See each of their solo tracks:
https://youtu.be/BEMaH9Sm3lQ
https://youtu.be/p8npDG2ulKQ
https://youtu.be/uTiIZBFpfok

Yes, they don't lipsynch on American TV or on award shows. They use backtrach cause their performances are choregraphed to death (MJ & Bey do the same)

https://youtu.be/jSFIwS2b-kg

But they do on pre-recorded korean variety shows to be fair.