Not all fonts support all alphabets. Therefore, it may be necessary to ensure that the correct glyphs will be available to the user who is doing the translation/localization (i.e. that the target-language alphabet can be rendered fully and correctly in the translated document).

When designing directly for print, only the fonts and characters for the master document are important. Therefore only styles associated with that document are necessary.

However, when designing a document that will be translated/localized into non-Latin languages, you will need to ensure that styles exist for all target alphabets and glyphs. This will allow non-designers to correctly style a document post-translation.

NOTE:
GREP styles can be used to automate the application of character styles to certain unicode ranges.