Literature
Death of the Artist
Roland Barthes said, "Death of the Author," and society said, "Hey, why not?"
They didn't actually kill them, and it wasn't just the authors, either, though there isn't much written about the artists in those early days. The theory was to pretend that there was no author, to better separate the text from the experiences of the writer. Of course, that's impossible to enforce. So society went the other way. If they couldn't separate the author's experience from the text, they'd separate the author from experience.
It worked well, at first. What author or artist wouldn't leap at the chance to live in a commune full of no one but other artists