I'd like to see more audio augmented reality systems. Translation, taking baby cry down a notch, amplifying speech directed at you, autofiguring out best moment to tell you things you might need to know.
This could end badly. I think the whole purpose of babies crying is to ensure you do something about it.
Not that there's always a solution, but I'd rather be awoken by a loud, irritating cry frequently than not hear them when they might need me.
Besides, I'm not sure how the number of babies harmed because of not crying loud enough compares to the number of babies that were hurt because they cried too loud.
Loudness of baby cries is probably delicately finetuned for other times when incentive to feed you baby had to overcome the desire to feed youself bit more.
I think modern humans have enough other incentives to keep their babies alive and healthy.
Disclaimer: I have no children. I am not significantly bothered by other people babies crying.
This is not the intended use, but people will figure out on their own and do it anyways...
Then, one day, a baby will die horribly or something, a solicitor will contact the parents... and profit!!! (or in your case, bankrupcy)
You are right that lawyers scare the crap out of innovators though.
But in seriousness as well, my first kid cried a lot, and it's not a ln on/off switch - even if you're hugging and cuddling and comforting them, they will still cry for ten minutes because that's what kids do. It mostly just makes your job more difficult. My second son had lungs of an opera singer, and the noise made it physically unbearable for me to be near him when he needed help. I mean literally painful to my ears. There were more than a few times when I have had to leave him alone until his crying calms down or stops because I can't do anything for him.
Wearing sunglasses could be seen as either way. You are definitively dimming the raw luminous stimuli that reaches your eyes, but you could argue that your are not dullying your senses but just filtering a part of the spectrum with low signal-to-noise ratio, so your senses are enhanced as a result. Technology can be seen as an extension of human capacity. That's what tools are all about.
This thing in the ear, it does not give you beyond human capacities, neither helps you recover regular capacities you lost by whatever circumpstances. This just let you pay for the privilege of not having to develop your capacities to begin with.