Transliteration into Latin characters of Cyrillic characters

I think it is a waste of time. Transliteration conventions vary significantly depending on the language, not just the script.

For example, in my country (Azerbaijan), we use the Latin script, but we write it as 'Pyotr İliç Çaykovski'. Since a font usually cannot detect which language's transliteration rules the user intends to apply, relying on a single standard like ISO 9 might not be practical for real-world usage. Readers expect the natural orthography of their specific language rather than a bibliographic standard like ISO 9, implementing this would likely be a waste of time for general font usage.