Brain without a body ?
The other thing you have to remember is that the brain did not evolve as a stand-alone computer in a box. It's an integral part of an animal which is a body that is incredibly well adapted to its surroundings - it can move around with extreme agility and also can sense, feel, experience and is basically a deeply integrated part of that environment.
An artificial computer in a box does not have that multi-billion year evolutionary history of having literally evolved out of the environment that it is part of. Rather, it's a quite abstract creation built by the biological entities that did just that. So it is starting from a very different position.
So, it will be very interesting to see how this develops over the decades and centuries ahead. Also whether it's possible to ever make the jump to sentience and consciousness. We could be missing a trick with that and we will just end up with more and more intelligent computers that are still not really 'alive'.
I think, however, humans are pretty arrogant in assuming that we're the only animals that possess those two features too. When you look around the animal world, we aren't a hell of a lot different other than we've developed the ability to express and communicate abstract thoughts as sophisticated language.
Does that necessarily mean that other animals don't have them? I don't really buy that argument at all.
We're all just versions of the same basic vertebrate evolutionary model so it would make sense that we share a lot of the same mental faculties, just developed in different degrees and directions.
I think we just like to mentally separate ourselves from the other animals we have a sense of superiority and a big ego but also, probably because it allows us to eat them. If we thought about every hunted / farmed animal in a cuddly way, we'd probably have issues doing that.