Originally Posted by AlPe
I challenge the word "discourage". I think the most appropriate wording is "it offers a systematically-established semantic-oriented way of replacing the <div>'s".
In other words: HTML5 offers uniform, very detailed tags to mark the semantics of your document, even though it does not disallow "bad (i.e., non-semantic) usage" of generic elements like <div>.
HTML5 is not yet standardized and has now been split off into two. So until HTML5 is standardized, ePub3 won't be able to be a standard.