There is no need for a fork. There never has been. You seem to ignore the fact that no one says you have to use any of those "features" if you do not want to.
And you are still missing that epub3 does standard fiction much much better than epub2 ever did with much better internationalization support and much better Accessibility (naming just two areas of improvement).
Always harping on epub3 because it supports audio, video, etc. while completely ignoring that it is a huge improvement for standard fiction as well just makes no sense.
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