It cut right into the time the presenters had available to talk and curtailed the personality jocks who had previously been a station selling point.
This is a good point. When the listener is tuned in and actually paying attention to the DJ then a segue into commercial isn't as stark as if the music stops and we're blasted with a long stop set. I'm no longer a regular radio listener but before I left for private pastures it occurred to me the days of the interesting DJ's was long gone. The music then became background and anything that interrupted that background irritated me.