I agree and disagree. If everything had unicode support, we'd still probably want to limit the codepoint set used for identifiers that are supposed to be unique

I agree and disagree. If everything had unicode support, we'd still probably want to limit the codepoint set used for identifiers that are supposed to be unique. Lots of characters have visually indistinguishable glyphs ('x' could be cyrillic kha as well as plain old x) and this already causes problems - see homoglyph attacks.