I have many ideas about how the industry can be improved, especially with the use of a smart phone app and user interactions.
Not only is it plausible, but would make the clinicians (fitter) job easier and lead to far more hearing aid sales.
Based on my observations of my father's struggles with various hearing aids, hearing aid smartphone apps are just as terrible as any other apps developed by hardware manufacturers. Don't expect the "clinicians" to help with this aspect either, because they were trained on a previous version of a different app and how could they be expected to figure out the apps that are used now?
then there's also additional complications like types of hearing loss impacting calibration - some people react very negatively to higher (or lower) frequencies than others do, to the point facial stimulation can happen, and some people just have a frankly tricky profile that requires a trained audiologist on hand to work with them through several sessions, if not outright yearly on top of that, since the nerves and brain output can change by itself.
(source: have a cochlear implant, been doing the described experience since I was ~ 3yrs old.)
I've had audiograms taken on moderate and bad days, and the difference in frequency response was significant (up to 30dBA difference across only the lower frequency bands).