EME doesn't describe an interoperable standard. It's only a tiny JS interface for invoking proprietary, deliberately unspecified CDM plug-ins (that are protected by DMCA, so you can't use them even if you knew how).
It's as if you wrote spec for `<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'/>` tag and said Silverlight is now a W3C Recommendation.
That's even a step back from Silverlight today, because at least it has de-facto NPAPI standard interface that CDMs don't.
Beyond that, it doesn't even define the plugin API side of it, only the JS side. Defining the plugin API would make the proposal less bad (!= good) as then at least the plugins wouldn't be browser specific (though I suspect quickly enough a de-facto standard will appear)
I mean, at least something like NPAPI is (somewhat) documented, so that one can support all NPAPI plugins in any browser (say, Flash, Silverlight on OS X, etc.), even if what the plugins do themselves it totally undocumented…
It's as if you wrote spec for `<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'/>` tag and said Silverlight is now a W3C Recommendation.
That's even a step back from Silverlight today, because at least it has de-facto NPAPI standard interface that CDMs don't.