I never said that it can't be understood...
As for things falling into place: The shift from animal to sentient thinking didn't happen over billions of years. In fact, relative to the life of the universe, human sentience is fairly recent and happened in a fairly quick shift. If you still believe that this is due to "evolutionary pressures" then so be it. But I just don't see how something so conveniently perfect can come about by happenstance of probability.
The shift from "animal to sentient" is probably mostly do to the evolution of language. Language allowed humans to pass on knowledge in a way that no other animal could. It also allowed for the expression of much more complex ideas than would have otherwise been possible.
The reason I put "animal to sentient" in quotes is because I don't think I'd claim that humans are the only sentient beings. There are animals that have shown the ability to problem solve, and some have even shown the ability to learn language (sign language specifically).
I also don't think that I'd use the word perfect because it seems to imply that we have no further capability to evolve.
It is chance. Simple as that. That chance may have some guidance based on its environments, but it still relies on chance. Not liking the word doesnt change what it is.
It is chance sure. But the reason I don't like using that word is do to the fact that most people don't understand statistics very well either. When they hear the word chance, they immediately think of things like coin tosses and dice rolls, where the probabilities are relatively small, not things where the probability is ridiculously large (like the chance of me quantum tunneling to Jupiter when I jump into the air).
I believe his reference to how little we understand, is that it is quite suspicious that our human brains cant comprehend something that happened by mere chance after this much research.
You say that like there aren't advances continuously being made.