@NotJohn ... Understood, but everything done in epub2 can be done in epub3 with some extra additions for backwards compatibility for older readers. Given how the industry is moving (or has already moved) to epub3 (Amazon kindle conversion works with it, ADE accepts it, Kobo .kepub, and more heavily used internationally), my vote is to create an epub3 that is as backwards compatible with epub2 only readers just to keep them working and alive longer.
The question is that okay with epub3 devs? Or would epub3 devs rather drop the ncx and drop the guide and make an epub3 that ignores epub2 compatibility.
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