I read this thread with a certain sense of deja vu.

I remember the cries of "Traitor" and "He's sold out" when Bob Dylan went electric.

Yet now we accept amplification - it is the norm in most concert halls - and even electrified instruments - though there are those who dislike them.

I think there is probably a place for the use of backing tracks if used with sensitivity and I am sure it will be seen more often in the future.

My daughter, when she was a girl, had a friend whose mother made her living singing in local clubs. She used backing tracks as she was not part of a band and almost certainly could not afford to pay accompanying musicians on what she earned from her gigs. I don't know what she got paid but I suspect her fees were not all that great as they did not have all that much money.

It strikes me as a useful tool for a solo singer.