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I think the idea of all these is to make the file not be recognised as text (which doesn't allow nulls), ASCII (which doesn't use the high bit), UTF-8 (which doesn't allow invalid UTF-8 sequences).

Basically so that no valid file in this binary format will be incorrectly misidentified as a text file.

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I think preventing the opposite is more pressing. Imagine creating a text file and it just so happens that the first 8 characters match a magic number of an image format. Now when you go back to edit your text file it is suddenly recognized as an image file by your file browser.

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