There are other settings more under the preferences category than DSP, like what profiles go on what switch setting, beeps, things like that. But these are all guarded jealously.
The aids are very expensive, more than $5k, for what's now ancient tech. They've only recently gotten BT and only then at the high end, more like $8k for the BT models.
We really need open hardware and software, so home users can get an audiologist to compute their profile and then do what they want with it.
But, she can hear, and she’s happy. I guess that’s how these companies get away with it—you can satisfy a customer without doing a whole lot of actual good for them.
My father who is in the age group now pretty much confirmed all of this when recently shopping for one. As it was covered by his health care they were trying to flog him one at a ridiculous price.