[GeoffR]

I leave the publisher's embedded fonts in the book, but I usually override it with my choice of font on the device.

I like the books where the publisher has used an ornate embedded font for things like chapter headings, scene break ornaments, etc. If it is done right then I can override the font used for the main text but still see the pubisher's fonts used in those places.

Edit: Screenshots from a book where the publisher has got it right: First shot shows the book with the font set to document default, chapter heading and main text are rendered in the publisher's embedded fonts; the second with it set to Georgia, the publisher's font remains for chapter headings etc. but the reader's choice overrides the font used for the main text.