> The progress of knowledge—and the fact that we’re educated about it—lets us get to a certain level of abstraction. And, one suspects, the more capacity there is in a brain, the further it will be able to go.

This is the underlying assumption behind most of the article, which is that brains are computational, so more computation means more thinking (ish).

I think that's probsbly somewhat true, but it misses the crucial thing that our minds do, which is that they conceptually represent and relate. The article talks about this but it glosses over that part a bit.

In my experience, the people who have the deepest intellectual insights aren't necessarily the ones who have the most "processing power", they often have good intellectual judgement on where their own ideas stand, and strong understanding of the limits of their judgements.

I think we could all, at least hypothetically, go a lot further with the brain power we have, and similarly, fail just as much, even with more brain power.