Yeah, I was being flippant. I certainly don't think openness and good UX are mutually exclusive, myself. Besides everything you mentioned I've seen rumors that

Yeah, I was being flippant. I certainly don't think openness and good UX are mutually exclusive, myself. Besides everything you mentioned I've seen rumors that one reason they're restricting third-party apps to a .NET bytecode sandbox is that they're planning to eventually swap out the current CE6 kernel for something different and incompatible (possibly NT-based), and they want to just be able to port the .NET environment rather than trying to persuade third-party devs to port their apps.