The goals are so ambitious that I think we have to be specific about we're talking about and specific about what won't work. (Because you haven't actually said

The goals are so ambitious that I think we have to be specific about we're talking about and specific about what won't work. (Because you haven't actually said anything about why it won't work.) If their first goal is to restore some functionality to severely paralyzed people with less big/bulky and doesn't leave a hole (infection point) in your skull, what won't work about that? Is it the body rejecting the implant? Is it the wires breaking down or migrating out of where they're placed? What is it?