We're also non-reprogrammable. Imagine if every human had a 2nd brain that could be built, and re-built every second, in an experimental attempt to see if that

We're also non-reprogrammable. Imagine if every human had a 2nd brain that could be built, and re-built every second, in an experimental attempt to see if that 2nd brain is equal to the original at everything (size and efficiency included) but then does at least 1 thing better? The problem is that this iteration takes us decades. Usually 0-6 iterations per human. Pretty damn inefficient. A computer with good enough hardware can probably go from dog -> human in a few weeks.