> My understanding is that codepoints beyond 65,536 are only used for languages that are no longer in use, and emojis

This week's Unicode 17 announcement [1] mentions that of the ~160k existing codepoints, over 100k are CJK codepoints, so I don't think this can be true...

[1] https://blog.unicode.org/2025/09/unicode-170-release-announc...