I got a fairly advanced hearing aid recently and originally thought they might be useful for listening to music too, like a good pair of headphones. This turns out not to be the case. Hearing aids don't have any bass. When listening to music, the best thing I've found is to use a regular speaker system along with hearing aids that allow some sound to go through them (the earpiece should have a reasonably large vent hole, rather than acting more like an earplug). Also, the DSP algorithms are tuned for speech so I got mine programmed with a "music mode", which turns most of that off for listening to music.

There are other limitations - the hearing aids don't support bluetooth directly (the antennas are too weak). Instead you have to use a streamer where the antenna is built into the lanyard that goes around your neck, and the quality is suitable for voice only. Since I don't make phone calls much, bluetooth support turned out not to be worth the trouble.

Don't get me wrong - the tech is pretty interesting, and I'd love to be able to program the DSP. But you need to know about the limitations when extrapolating.