Comment by tshaddox

I wasn't referring the "luck" factor of evolution, which is of course always there. I was asking whether "luck" is the reason that the cognitive capabilities which presumably were selected for also came with cognitive capabilities that almost certainly were not selected for.

My guess is that it's not dumb luck, and that what we evolved is in fact general intelligence, and that this was an "easier" way to adapt to environmental pressure than to evolve a grab bag of specific (non-general) cognitive abilities. An implication of this claim would be that we are universe-understanders (or at least that we are biologically capable of that, given the right resources and culture).

In other words, it's roughly the same answer for the question "why do washing machines have Turing complete microcontrollers in them when they only need to do a very small number of computing tasks?" At scale, once you know how to implement general (i.e. Turing-complete and programmable) computers it tends to be simpler to use them than to create purpose-built computer hardware.