[freshhawk]

probably because relative size is a good proxy for evolutionary "resources" being allocated to brains.

why absolute size doesn't matter as much as we think it should is a really good question, but clearly our modern transition from "the nervous system is like a steam engine" to "the brain is like a computer" is only an improvement and not actually a good model yet.

So, when "one thinks of compute capacity" one arrives at the wrong answer instead of one that fits the evidence and statements of the evidence seem like "a strange argument".