Good point - also a very plausible explanation.
I mean, I'm pretty sure that I'd be totally fooled by the SuperJ'onn trick, but I also think Cat is probably smarter and more incisive than I am. I like the way that you put it - the show will work better if they treat the characters respectfully as intelligent people. So…

As much as this week's Cat Grant storyline seems like a walk back, the show has handled that side of the story well enough that I'm not 100% convinced that Cat has been dissuaded from her Kara-Supergirl theory. While having both personalities in the same room seems like incontrovertible proof, the episode emphasized…

It's made especially bizarre by the fact that people never actually believed in a flat earth. We've known the earth was round about as far back as we can look. It's possible that a somewhat marginalized minority once believed in a flat earth (and still today), but it was never an important part of proto-scientific…