If software can't cope with the PUA, that *is* defeating the purpose of the PUA (two people can and should be allowed to exchange data in it by agreement, they just shouldn't expect everyone else to subscribe to that agreement). Unfortunately there's no block of codepoints in PUA pushing its incorporation into software, the way Cantonese did for the Astral Planes; but it is still a misfeature, and it is appropriate for Mark to complain about it.
As far as I understand the problem is one of font only, where an OS makes assumptions about what font should be displayed when a PUA character is used.
Though I think the solution is to fix PUA support, not to bring Klingon up to the ISO again...
In time, if Klingon demonstrates actual use, it could be reconsidered. And I mean in time, and substantial use. But there's nothing that says that it, or indeed the Phaistos Disc, are banned forever.
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Michael Everson * * Everson Typography * * http://www.evertype.com
