Whatever about epub3 vs epub2 it's bogus to claim epub3 is needed to meet accessibility laws. That's my main point.
Also for regular fiction an epub3 conversion from docx adds nothing the epub2 doesn't do.
When there are many useful features to epub3 (maths being the most important) they lost sight of ebooks and have tried to make it compete with web pages and multimedia apps. Fixed layout was a nonsense as PDF does that and it's not a real ebook format as real ebooks need to reflow.
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