Romanization is a separate issue to using fixed glyphs.

There was a theory in the XIX / early XX century that full literacy was impossible without the Latin script but such claims are ridiculous especially for Arabic which is an alphabetic script already. China has higher literacy rates than Vietnam, for example.

I don't think the many composition rules of Unicode are really necessary, though. Maybe as an extension for academic work or artistic compositions but not for computing.

If all we had were movable types, all of these language users would find a way to write their language that wouldn't require a Turing-complete computer on each glyph. Now the Unicode gods pander to some of these computer-hostile scripts making the users of different scripts feel slighted.