epub3 as a file specification supports multi-media but public domain e-reader support is spotty at best.
Creating ebooks with ebook authoring software--that include multi-media--has a steep learning curve. I tried working with a few of the open source editors and immediately reached for the Rolaids bottle.
I know how to do HTML, static dynamic and otherwise. I can make it look like visually indistinguishable from a 200 year old manuscript displayed on Kindle. I can also--very easily--add video, images that expand on a click or tap, galleries, sound, etc. The "easy" part is important. Web technology is advanced by comparison to the ebook technology.
That's my argument.
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