Hot answers tagged kana
The reason is very simple: universal education. ゟ is not a "kana" but an abbreviation (合略仮名) used in the 1800s. In other words, it is not an outdated letter like long s (ſ), but a scribal abbreviation like "Ↄ̄" for "contra". It was mainly in use when writing was limited to a small literate class, and when language began being taught to the public at large, ...
While I hope the time has led the questioner to the correct understanding of this problem, I find it a rather interesting question being asked. It's true that a precise phonetic analysis reveals differences between realizations of the vowel //u// by its environments, or generally, that a vowel's sound quality slightly differs according to its preceding ...
It's considered obsolete because it isn't in use any more, and people don't really think of it when they want an archaic flavour.
ゟ has fallen nearly entirely out of standard usage. This means that if you show it to most people, they'll have no idea what it means, and you should definitely not use it yourself in regular writing. Instead, write out より with 2 kana, as this is standard now.
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