I wouldn't say that human intelligence is "the pinnacle" but I do think that more intelligence might not turn into the ability to solve harder problems.

For instance the problem with high energy physics is not that people don't have ideas but rather we have limited experimental and observational results that would let us tell one theory from another.

Similarly I don't think more intelligence would help in solving the Collatz conjecture.

Hey, i think there's no such thing as an upper limit and we can always go further or become better. We will never reach the maximum, we can only reach the limit that we won't cross.