I doubt your disproof of super-smart people, for the very same reasons you do, perhaps with a greater weight assigned to those reasons.

I am also not sure about your definition of super-smart. Is idiot savant (in math, say) super-smart? If you mean super-smart=consistently rational, I suspect nothing prevents people of normal-smart IQ from scoring (super) well there, trading off quantity of ideas for quality. There is a ceiling there as good ideas get more complex and require more processing power, but I suspect given how crazy this world is Norm Smart the Rationalist can score surprisingly highly on relative basis.

As a data point you might want to look at "Monster Minds" chapter of Feynman's "Surely you're joking". Since you mentioned Feynman. The chapter is about Einstein.

Finally, where is your blog? ;)