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Well I guess we better all tell you what we are working on in our free time so you can reassign us if there is something you think has higher social utility.

For things like that, you really need to have a passion for working on it, and develop a fairly specific skillset, not only in the technology realm, but in the medical realm. Hearing aids aren't just stupid expensive earbuds.

This is the thing he's working on now. He's working on other things. He has hobbies and he has a job. He's going to do what he enjoys doing. Who cares if it's not useful to you or me.

There are other people working on those problems.

As a diabetic, I've been fascinated to watch the progress of things like AAPS, Loop, OpenInsulin, etc. But I'm not going to demand everyone working on "useless" things to jump on the thing that I will specifically benefit from.

His skills may be more niche and nuanced than you may make it seem

you should watch eli the computer guy.