There are hearing aids with bluetooth so they double as wireless ear buds.
Curiously enough, while the sound quality of speech streamed to my ReSound hearing aids is fantastic, the sound quality of music is abysmal. But sound quality when wearing both hearing aids and good-quality over-the-ear headphones is perfect. I’m reasonably (but not absolutely) confident that music would sound better played from the watch than streamed to the hearing aids.
Blowing the speaker isn't an issue, I agree; but sound quality would be. What is acceptable in a voice output would not be with music and the you'd have a pretty poor experience. Apple does not want taht as people would complain about the sound of music and not be glad it can even play music.
Let me argue the other side of the coin. While I’m all for accurate sound reproduction when listening to music … as, yes, a classical musician with an university degree in performance, there are all sorts of cases where a pair of tin cans with string gives you all the sound quality you need. Anybody who would seek out, for example, recordings of Caruso originally sold on wax cylinders (including modern digitizations of the same) will not at all be bothered by the sound quality.
I grew up listing to the Met Opera’s live Saturday matinee radio broadcasts … often on AM … in a ’68 VW Camper, going down the freeway, with the windows down. Or, similarly, in the back seat of a ’55 Bug with the factory-original radio — and don’t forget where the engine is in those cars. Wouldn’t have missed it for the world.
Personally … the ideal for me would be a true seamless experience where any nearby device I’m signed into with iCloud, including the Watch as well as any Bluetooth-connected audio device, is a speaker choice from any other device. As in, yes, I should be able to stream from my MacBook Air to my Watch, or from my iPhone to my iPad. Regardless of how silly it might seem to do so. For example, I might be listening to a live broadcast on the Air, not have my hearing aids in, the phone is charging in another room, and I want to take the garbage out; I should be able to, one-click, hand off the audio to the Watch and not miss a beat.
I’ll also admit that this is a rather low priority for me. I manage to live just fine with the way things are.
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