[slaterbug]

I’ve been daydreaming lately about what the fundamental limits of “intelligence” could be, something like the concept of computability but for AI, or even biological brains.

Though I will say, surely the existence of the human brain (which by definition is general intelligence), suggests that creating AGI is fundamentally possible?

[dsr_]

Sure, it's possible - as you say, we have an existence proof. We don't know how to do it any other way, though. None of the people who claim that they or somebody else is on the trail has produced any evidence that they are correct.