At one time, rock stars were essentially anonymous and could have relatively normal lives when not on tour. The audience was huge and they were essentially faceless.

Then TV, music videos and the practice of having huge screens broadcasting the faces of the band to the audience ruined that.

KISS used face paint and that helped protect their identity, but when they got too big, you saw Gene Simmons wearing a mask on dates to try to preserve his privacy, yet everyone knew the masked guy was Gene Simmons.