Good points, especially that last bit. It's pretty obvious from the S6 interviews that the writers had Very Firm Opinions about how things should be viewed and interpreted. I can't imagine that they would be able to keep that out of their writing, even with Joss the Existentialist supervising. I really doubt he was looming over everyone's shoulders policing their work to eliminate all attempts at meaning.

I think what it comes down to is that Joss allows us the freedom to determine meaning on our own, without throwing a tantrum if we disagree with him. But that doesn't mean the text itself doesn't contain a bias toward a certain meaning, and I certainly don't blame the audience for noticing that bias - or for being annoyed when it conflicts with their view.