[msla]

Ensuring filenames don't get destroyed by an OS that refuses to understand a given language. Case is a complicated mess once you leave ASCII, and that's partially because ASCII is lying to you about how English case works: Yes, the English language has title case, and ASCII conflating it with upper-case does not negate that.

Move on to most anywhere else and the notion that it's fast, reliable, and safe to convert case gets lost in the realities of human writing systems.