In your analogy, it would be like if my vision got worse and I got eyeglasses which partially restored it, but mirrored everything upside down with tons of static. Now I've got to learn to read upside down and tune out the static, but don't worry because I get 10 free lessons with a reading instructor. Oh and none of this was clearly explained to me or part of my expectation when buying glasses.
And once you put on your glasses everything is brighter.
You need to adjust to the change, and then slowley adapt.
Now what if putting on the glasses meant you saw far more on your peripheral vision?
This too would be a big change and a barrier to getting better.
Hearing aids are the exact same. It's slightly unnatural but once you learn how to use the tool, it's a super power. I can hear conversations in crowded bars when normal people can't. Loud noises compress in a pleasant fashion. I just have to get used to some occasional spatial distortion and subtle flanging
Or, alternatively, it's exactly what I said and the device + audiologist combination just isn't up to correcting a lot of common hearing issues. That seems far more likely than the vast majority of people doing everything wrong.
Imagine not reading for 10 years because of bad eyesight, eye glasses do not make it so your brain can read, but instead makes it easier for your brain to see the symbols. your brain still needs to decode and comprehend them.
Our hearing system is far more complicated. You can look in the direction you want to see....but you hear all around you, even through walls.
You cannot stop hearing, even in your sleep. It is far more crucial to our environmental awareness than more people realize.