I don't understand, why Unicode must (should?) contain superscript and subscript glyphes at all. Declared goal of Unicode is to have encoding of all characters used by all languages, past and modern. Subscript and superscript are not used by any language as separate characters, it is typesetting property. It should be solved by other means, not by character/glyph encoding.
Should Unicode include ALL characters strike-out? Underlined? Double-underlined? Small-caps variant for all letters for languages where small-caps are used in typography tradition?
And, BTW, what do you mean by "all letters"? Should Unicode contain sub/superscript variants of Hangul or Devanagari or letters from hundreds other non-latin-alphabae languages? So, Unicode must be approximately tripled, bar hieroglyphic part (and why hieroglyphics should not be sub/superscripted?)?
And, BTW, what do you mean by "all letters"? Should Unicode contain sub/superscript variants of Hangul or Devanagari or letters from hundreds other non-latin-alphabae languages? So, Unicode must be approximately tripled, bar hieroglyphic part (and why hieroglyphics should not be sub/superscripted?)?