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Would it really be POSIX-incompatible? Does the standard mandate that a filesystem can place no such restriction on top of "filenames are unencoded bytes"? If not, then it's just that tools cannot blindly assume filenames are decodable. Isn't MacOS guaranteeing UTF8 these days, while still being POSIX-compliant?

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I don't know if there is an explicit mandate for that in the standard, but forbidding this that were previously allowed, both in code and documentation, is not backwards compatible.

Just imagine a file system that wouldn't allow the character "e" in file names.

Of course, the impact would be not as drastic, but still it's backwards incompatible.

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