But the thing is that the file system doesn't need to be case-insensitive for your system to support human intuition! As others have said, people don't look at

But the thing is that the file system doesn't need to be case-insensitive for your system to support human intuition! As others have said, people don't look at and use filesystems, they use programs that interface with the filesystem. You can absolutely have a case-sensitive system that nonetheless lets you search files in a case-insensitive manner, for example. After all, to make searches efficient, you might want to index your file structure, and while doing that, you might as well also have a normalised file name within the index you search against. Now, as you said, UNIX did the choice that's easier for computers. And for computers, case-insensitive filesystems would be worse. There are things that are definitely strange about UNIX filesystems (who doesn't love linefeeds in file names!?), but case-sensitivity is not one of them.