Regarding the ebook section, EPUB 3 does in fact support interactivity along with video and audio [0], among other features, so it's not a technical limitation

Regarding the ebook section, EPUB 3 does in fact support interactivity along with video and audio [0], among other features, so it's not a technical limitation but rather one of effort for book creators, and for compatibility between multiple ebook readers. [0] https://blog.bookbaby.com/2011/10/epub-3-explained-features-of-the-new-ebook-format/ https://blog.bookbaby.com/2011/10/epub-3-explained-features-...