I really don't think it's a old fart thing to suggest that music should be encouraged to be live.
It's really not a modern/ old thing at all. This argument has been around since the 80s.
If you can't see the difference between, for example, Lizzie singing along to a CD or having a full backing band (her last 2 sets at Glasto were very different) then you're a bit of an idiot.
Another example. Madonna Blonde Ambition tour with some of the finest musicians around and the recent tour where it's backing tracks and almost not live musicians.