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UPDATE:
more testing, more clarity...
I made a test copy of a book & stripped out every font family as you advised. Yes, the reader fonts are now switchable. I also noticed that if I minimise line spacing, there's a bit of an optical illusion effect, it seem like I'm using a worse font and it looks like a different font whereas really is just a bad line setting.
now, opening that same book in calibre editor - the book preview is not too bad, better than the sigil book view so maybe a can lose all my font-family settings with no great pain. They had no effect on Sony reader anyway so no loss there. But I'm not aware of any tweak that will automate finding and stripping every instance from one or many books ?
but more complex books may have e.g. font-family:sans-serif; for headings. I would need to test what happens if one or more of those is left in - ill Kobo still apply it's fonts to the story text ?
back to the simple test book. I think I am seeing that font choice " document original" is the same as font "Georgia" on the Kobo - is that the case?
& if YES then is the effect of leaving in some font-family:serif; commands just to lock the font into that Georgia option ?
does accidental leaving just one of those in, say within one of several paragraph styles, lock the whole book out of font controls ?
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