What can we know?

You might think, yes, humans have enough intelligence to at least formulate and conceive of any particular topic. Intelligence is a threshold property and we have enough to do anything in thoughtspace. It might be hard, but its possible in principle.

This is obviously wrong to me. thoughtspace is a construct of our experience, our brains are just holodecks and there is no reason to assume any experience is constructible.

Anytime you grok, that is just a constructed feeling. You can simultaneously feel grok, but be mistaken. There is no reason to believe every state of knowing true facts can be experienced.

Its not even reasonable to think that all of experience-space is reachable. And not reasonable to think experience-space covers state-space. And not reasonable to think parts of inaccessible state-space wouldn't be meaningful if encoded as an experience.

We are billiard balls on a table. There is no use wondering what it would be like if we were being juggled instead. It would simply be like it.