Some of those syllabaries have been turned into abjads and alphabets over the years, though, and some modern constructed writing systems take inspiration from the Latin alphabet to form syllabaries. I'm not sure that the set of things in the state they were in when first invented, excluding their descendants, is a good way to divine a meaningful absolute human standard. I'd love to have a timeline showing the writing systems in use and their lineage, colored by type, and scaled by number of users.
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