International ASCII still only has 256 characters max. Not enough to hold multiple languages and symbols. You need at least utf-8. What if the book has images though?

Ascii table has limited currency signs and mathematical sysmbols. What if there are more than one languages e.g. Chinese or Arabic? What if there are Emojis?

What about different currency signs and mathematical symbols, em dash and en dash etc?

What about numbers and punctuation?

LOL