We used to do "comping" of vocals back in the 80's, and afaik it's been done since the early 70's. We did this on the 2" 24 track tape recorder by copying/re-recording bits of multiple takes onto a single track.

Then came Auto-Tune. That meant that less perfect singers no longer would have to strain themselves by performing a dozen tracks, we could do with three or four, focusing on performance and feel. AT would assist with the pitch. Sessions actually became more creative, since the tools were better than before.

So "perfect vocals" have been around way longer than Auto-Tune. We just did it in a more tedious way, and wore out the singers vocal cords in the process. Pop is just pop. Other genres will always cater for those who want to listen to more "real music".