Our consciousness is ascendant in nature. It evolves, and more to the point, it
enjoys evolving. It is not
necessary to evolve, as we/god are perfect and know all things already, but the
experience of growth is very special to us, spiritually speaking.
From that perspective, it would make sense that their would be a myriad of avenues for our souls to experience growth or expansion, and it just so happens the human body is one of those forms. There are other forms -- ones with less restrictions on soul expression (more complex body computers in other words). But, the human body was there, and for whatever reason, we chose that particular form of expression to experience growth through.
So what I'm getting at is that it is not so much that Source created humans to
be a certain way (it DOES create them, but it likes everything just as good as everything else), but rather, that is simply where those bodies are on the evolutionary (and spiritual evolutionary) ladder. We saw where they were at on that evolutionary ladder and decided to use them to experience the growth we so desired to experience. The bodies are still evolving. Perhaps one day, there will be complete continuity from the spirit world to the physical world and no loss of expression will be experienced. But who knows when that will be.
But this is not to imply in any way that it was
not desired that the human form be that particular way. Trust me, there were other types of bodies available. So there must have been something desirable about the way the human form develops that attracted us on some level. Perhaps to experience a brief escape from self awareness for a time -- perhaps to experience the innocence of the child who doesn't know better -- perhaps to experience the primitive state of the human brain

?
There could be many reasons. I'm not going to pretend to know them all.
