Next, humans have this weird brain thing, connected to thousands of sensors. It has many flaws, but a thing it's very good at is interpreting and reacting to the environment. We have some pretty cool sensors and processors, but nothing can even approximate what our brains do casually...

The form factor also doesn't leave a lot of space for power and processing. Both are getting smaller and smaller, but neither fit well into a human shaped space. At least not yet.