On: An error message, still found in Windows 10, is a ...

[13of40]

Fair anecdote, but compare that to all of the untold millions of times someone's day has been derailed because they didn't push the shift key. It's a user interface, not an API.

[Drdrdrq → 13of40]

Does that really happen? Both CLI and GUI utils help find the correct file name (using Tab and by sorting, respectively). Can someone raise a hand if that happens to them?

[hurrrrr → Drdrdrq]

raises hand not with gui but with cli.

Autocompletion stops early because 'SomeReallyLongSourceName.h' and 'SomereallyLongSourceName.cpp' are not the same after the fifth letter. It breaks globbing.

[paulddraper → 13of40]

On the contrary, the file system is an application programming interface (hence its presence in every standard library and kernel).

File explorers, etc. are user interfaces.