That's my thought as well, you should remove any lines referencing a font-family name. Even if you don't have the font embedded or installed, the book will try to match up to another font that may not be to your liking.
I'd also remove any font-size references where it pertains to the main body of the text. I would leave a special size for the copyright page for instance, chapter headings, etc. But for the main body of text, I want to be able to adjust the size normally without any limitations.
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