Well there's obviously a lot of confusion and uncertainty here. I make epub3. Apparently that can only be read by the kepub renderer. The kepub renderer overrides margins it seems by the experiments earlier.
So I still have no idea what the bottom line is. The only way I would find out for sure is to test on a Kobo. But it's clear to me that a 0.5em margin, whether or not it can be overridden, is certainly nothing to worry about, even if some people who prefer 0.3em may be aggrieved.
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