I'm going to de-lurk here to respond to William.
(1) Private Use Area is just that; private. I work for Boeing and we might use very technical glyphs that would only apply to the business we do. We could make a font, assign them codepoints in the PUA and use them on the Boeing intraweb and feel confident that they're not going to conflict with other applications inside or outside the business at hand. What you describe as assigning general guidelines to "rational segments" of the PUA is just a muddy way of assigning codepoints within the PUA.
(2) This is a public forum held for and moderated by the Unicode Consortium. I am on equal footing with the all of the other participants, regardless of their various day jobs. My opinions, are just that - opinions, and stand on their own merits. Rick, Roozbah, Mario, Ken, yourself and whoever are in the same boat my friend.
Thanx
Wm Seán Glen
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