What kind of troubles may occur if Unicode characters will be entered directly in the following situations (English, no math):
Diacritics: for example,
ΓΆinstead of\"{o}.Em, en dashes and minuses.
Quotes (assuming that it's an English text anyway and rules are applied correctly)
In this domain, what approach (direct Unicode or traditional input) is more flexible in terms of possible export options (html and its archived brother epub)?