[CodeBeater]

This is probably the primary use case. Although modified FM radio receivers could easily receive analog TV audio it just would be a harder sell.

Also, sometimes companies do things just to show off their capabilities to the market, especially Japanese companies. Sony were the kings of this tactics back in the day.

As a side note, in the typical western FM band allocation (88 - 108MHz), the analog TV audio carrier for channel 6 would be located just under that (at 87.7MHz), and since most radio receivers could go a little under and over that range, most people could listen to channel 6 audio on the go.

This generated an entire market of "TV" stations who's main purpose was to broadcast audio, in the United States they were nicknamed "Franken-FMs".