It has nothing to do with accurately displaying them, and everything to do with the fact that the cause actual problems and in a utf8 locale you gain NOTHING from being able to use 0x01-0x1F in file names (if you're going to bring up storing 'arbitrary' binary keys in file names, don't, you already CAN'T because you can't use '\0' or '/')
There's an article about exactly this somewhere, IIRC linked from LWN at some point in the past when the patch that allowed to you disable those chars came up I think.
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