I completely agree, the HAs are only ever stereo at best but it is the other people that I am watching the movie with that miss out on the fancy sound effects as they have to accommodate my hearing loss.
Unfortunately these new formats are the default now and lots of TVs come with sound bars so the problem is just growing.
@platypus If you set the system to normal Dolby Digital 5.1 and/or turn off eARC then you should be able to get a usable signal.