Why doesn't Ideographic (ID) in UAX#14 have half-width katakana?

[Philippe Verdy]

2015-04-28 10:09 GMT+02:00 Werner LEMBERG <wl at gnu.org>:

> Yes, for typographic purposes.  But typographic issues are not covered
> by Unicode.  AFAIK, the existence of half-width kanas in Unicode is
> purely for backwards and round-trip compatibility.
>
Yes, compatibility with typographic conventions.

And yes I have seen half-width text rendered vertically (always rotated:
I've not seen them for now aligned like in crosswords...).
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