I think you are mistaken my view with someone else. It is true that I see faults in the format.
I don't mind people making books specifically for iBooks, just don't call them ePUB, since they are not. I also have no objection to ePUB3 books, as I stated before I do see some usage in them for specific types of books.
However, what I do object about that instead of looking to the problems there were with the old version and fix those, they listened too closely to Apple and Co and were too eager to put in all kind of stuff with regards to multimedia. There were already enough possibilities for those (called apps...).
The format itself is definitly not perfect and will create a lot of problems, especially with the interpretation of it. I am far from conservative, but I do object to progress in the name of progress. It must add something useful and in my book audio/video/scripting is not.