Unfortunately, you are more than right. They have been horrible shepards of the epub standard, implementing many backwardly incompatible changes for no real benefits of any kind. They seem to not understand about the user's perspective at all and have dismissed the importance of metadata with very little thought at all.
The only good thing that has come from the epub3.1 spec is deprecating silly non-standard things like the switch statement, refinements, erc, and trying to move the spec closer to what html browsers already implement.
If they had thought things through from the beginning, they would have done that, and everone would have implemented a webkit-like widget and general support for features would have been much broader. And any changes would have been backwards compatible.
The IDPF really is out of touch with how people use, read, and catalog their ebooks. It is a real shame.
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