

I don’t think the understanding of the human brain is really good enough to engineer a properly functional one.
And I suspect that any companies touting they have such a device are ether overstating how effective what they have is, or outright lying about the capabilities.
If we did have enough understanding to engineer a device, I suspect it would be possible to fix such issues without grafting in electronics.
Anything beyond publicly funded research smells of grift to me.
Exactly, we don’t know how the brain would adapt to having electric impulses wired right in to it, and it could adapt in some seriously negative ways.