I'm not even sure case insensitivity would be the naive human thing to expect. When I first made contact with computers (and typewriters!) in elementary school

I'm not even sure case insensitivity would be the naive human thing to expect. When I first made contact with computers (and typewriters!) in elementary school around 1990, whenever I pushed space while holding shift I got worried that I created an "uppercase space" and quickly deleted it with backspace. I kept that habbit for quite a long time.