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In my experience, converting epub2 to epub3 offers very little unless you are also planning on editing the epub3 to make use of it's new features. The few times I've needed to do that conversion has been due to a requirement for accessibility features.
For those conversions, I am very thankful for KevinH and his ePub3-itizer and Access-Aide plugins for Sigil which did much of the work for me. Add in much gratitude for Strahinja Val Marković, John Schember, Kevin Hendricks and Doug Massay for their work on Sigil and Kovid Goyal for his work on calibre's ebook-editor.
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