A DRM plugin framework is by definition a plugin framework. I relly don't want DRM in html either, but I have a hard time finding logical arguments against it, and I don't see how this is a good one. If you could further your point, I would love to hear it.
>> Secondly its expressed intent is to take away functionality
Take away what functionality? The ability to download audio/video? Again, playing the devil's advocate, I would imagine a vast majority of the content that would be streamed using the DRM encodes would not be streamed using the video element currently - it would be streamed over flash/silverlight, etc (think netflix, hulu). If that is the case, what is it we are losing?
>> I'm not aware of any other instance where a web API is created to disable features of a user's computer
To be fair, this isn't. EME is just a way for people to create addons that leverage native encryption. The same is true of the current plugin system.
>>I'm sure we can rattle off more ways that it is different, but I'm not sure what you're looking for here. I am looking for logical reasons to say why adding EME hurts the open web so when I get into arguments I have better reasons other than 'I hate it'