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As for epub3 support....
That may be one of the issues the developer had. I suspect it might be almost easier to create a separate program for epub3 than try to shoehorn it into this existing epub2 program especially since it is always aiming for valid code. I think there is a lot in common, but not enough to just be able to bolt on epub3.
Kindle is the biggest part of the marketplace and many people start with epub as a base. It is not a stationary target though and there is the possibility of endless support questions about why the created epub won't work once converted to Kindle.
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