nope. It is just that we didn't have strong enough competition from other predator species to force the efficiency increase. Instead we use the extensive way of increasing the size, even if it is accompanied by decreased efficiency. Like going cheap low-tech V8 instead of efficiently increasing horsepower of a V6 engine.
>astonishingly superior abstraction capabilities
yep. that one. The top manifestations of that ability were Inquisition, Hitler, Stalin, etc... The astonishing ability of our brain to generate various abstract reasons to kill. This ability is the only qualitative difference between humans and animals. Most people aren't able to handle beyond the simplest physics and mathematics reasoning, yet easy to come up with a set of "other" people and pretty abstract reasons why these "others" should be violently oppressed and killed. The ability to handle mathematics and physics is just a side-effect that is manifested only by a few. If you look into the history of human species, it is a continuous blood-shed, and whenever there is a patch of technological progress it is most visibly expressed through new technological means of violence.
> and the ability to speak and write
tools to help communicate and organize around the above mentioned main human ability to come up with reasons to and actually perform the killings.
>mostly because I don't suspect you really have a firm enough grasp of QM, let alone QFT, to determine its aesthetic beauty
I have an MS in Math, and spent enough time on QM to get a "grasp". It is not about aesthetic. It is about method and our level of understanding (or lack of it) that i consider ugly. Vs. complexity - where it is in QM? The mathematical machinery there is pretty simple compare to the state of the art in mathematics.