Most people don’t know this but most author type or write their books in formats already suitable for submission. Perhaps they do, as to why each ask for a different format when submitting a manuscript. What works for one company won’t do for another.
Shunn Standard Manuscript Format
People may haven’t notice this but every font asked for in book submissions doesn’t always transfer well into an Ebook. Times New Roman is one that doesn’t do very well. It’s doesn’t transfer well especially if there’s italicization in the book. So, sometimes you may have to change the font of the Ebook to make it clearer from that of the physical book.