For something that is starting to border on consumer electronics, the hearing aid industry is very frustrating for a young person with hearing loss. Not just the $7000/pair cost every few years, but the closed system of hearing aid companies and resellers/servicers. Having to schedule an appointment in a week, because this week's tweak made certain frequencies sound terrible, and the bluetooth dongles for adjusting settings are only available to authorized resellers or occasionally on the grey market. If it wouldn't completely disrupt the audiology business, there would have been phone apps with the same functionality years ago. I don't see that changing any time soon, since it's an industry built completely around servicing the elderly who are much less likely to engage with such technology.