What I complain of as not mentioned in the Standard, is that U+2044 can be used with superscript and subscript digits, rather than ASCII digits.Almost any character(s) in Unicode "can be" used with almost any other. You can surround U+2044 with emoji if you like. That doesn't mean you should.
This is a key point.
You can use many code points to get some
"effect", but that doesn't mean it represents
good practice or should be recommended. There are no "traffic
cops" out there that
will flag you down for having made a poor decision, but that's
not a reason enough to
endorse random suggestions.
This goes particularly for practices that
need support in systems and/or fonts to work
correctly. If some implementer supports the recommended normal
size digits for 2044
why should they do the additional work of making sure it works
for super/sub script.
A./
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