Yes, but there are glyphs, especially in Indic languages, that have no representation in a presentation form in Unicode. If you are familiar with Arabic, each

Yes, but there are glyphs, especially in Indic languages, that have no representation in a presentation form in Unicode. If you are familiar with Arabic, each glyph has forms - isolated, beginning, medial, and final. Your "typical" Arabic string is composed of isolated code points, they go through a text shaper, and out come glyph indices that also have a Unicode code point associated with them. You do the same thing with an Indic language, except imagine that the glyph indices that come out have no corresponding Unicode code points. It's very surprising at first and some software can't handle these unassigned or "hidden" glyphs. So my point is: how much value would there be in requiring a representation of a small fraction of the glyphs (only those with Unicode code points, many of which are ZWJs) in a script in a standards document when potentially hundreds of forms are necessary after shaping to represent the language?