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ASCII already has designated bytes for unit, group, and record separators. That aside, a big drawback of using unprintable bytes like these is they're more difficult for humans to read in dumps or type on a keyboard than a newline (provided newline has a strict definition CRLF, LF, etc)

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There is no reason those ascii characters need to stay unprintable. You could use other characters like an interpunct, silcrow, or down carat.

There is in fact a reason those ASCII 'characters' should stay unprintable: the 0x00-0x1f (except Tab, CR, LF) range is explicitly excluded as invalid in a whole bunch of standards, e.g. XML.

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