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There is nothing wrong with a 'whole lot of slow cores.' In fact, it is essentially how the human brain works.

And who said that "how the human brain works" it's what's best for what we use a computer for (hint: not just AI).

If we had just that, then we couldn't do 3D graphics, number crunching or any other highly computational task adequately.

GPUs (which are useful for both 3D graphics and number crunching) are actually a bunch of slow cores.

You picked some bad examples to illustrate your point.

Not so sure. The human brain is bad at number crunching.

GPUs are not just a "number of slow cores" they have other, enormous optimizations that the human brain does not share.