We may not have a good interface directly into the brain for memory, math, and facial recog; but that seems like a problem would could solve. After all, what are our eyes and a phone but a kind of klunky prosthetic for a deficient brain?
What we really don't understand is how this impacts our state of being. If I have a cybernetic implant that allows me to preserve the memory of my family, I'm still alive, right? Simply having access to knowledge of my life doesn't steal my consciousness. Otherwise, family photo albums would make me legally dead.
What we really don't understand is how all the stuff in our brain and body make us conscious human beings. We'll still die; but what does death look like? Is a machine with all my data still me? Will death just be a slight twinge of existential angst, followed by me no longer being a real human being? Or, is a full upload still conscious? What's going to happen? Real immortality, or just a slow transformation into a fancy animated corpse/memorial?