Agreed. Personally it's a pet peeve when idols lip sync/loud backtrack. They're performers, they're meant to sing and rap and dance at the same time!
in a perfect world they can, but they also get proper rest between performances instead of doing six music shows a week where they have to be there for 8-10 hours a day plus all the other side promotional work they film plus whatever else they have to practice for.
The only performers who usually do are musical actors who usually have understudies who can perform when they're in bad condition



