But in this case of auto tune for voices the vocalist can have all the right or merchandiseable qualities but doesn’t have true vocal talent, auto tune fixes it all. I don’t think it killed session musicians. It just gave producers more control over their merchandise.
It’s more important to have a wide octave range than to be on pitch.
Whitney Houston in her later years had great difficulty with pitch - no problem auto tune saved the day.
PS - I don’t think the drum machine actually killed the session musician. It may have given less talented bands
a helping hand or for artists like Trent Reznor - the Pet Shop Boys and someone like Brad Delp better access to the mainstream arts. In any event, drum machines and electronica had created a new sound. Synthesizers have broadened popular music the way that he electric guitar did.