Comment by asherah

you can't not handle devanagari, tamil (or like half the scripts across the Indian subcontinent and oceania) or hangul. even the IPA, used by linguists every day, would be particularly bad to deal with if we couldn't write things like /á̤/, and some languages already don't have the precomposed diacritics for all letters (like ǿ), so the idea of a world with only precomposed letter forms is more of a exponential explosion in the character set