A well-written piece and I understand your argument. However, I take a more nuanced approach to this issue.

Accepting that we all have different preferences, personalities, temperaments, backgrounds, and so forth, and whilst acknowledging some audiences may actually like directly preachy stories, I don't. I personally have become increasingly wary of stories that contain deliberate agendas of any kind (including those causes and messages I agree with). It can kill a story dead and turn it into a sermon. In it's worst manifestations, it comes off as sanctimonious and condescending.

As someone who has had novels and short stories published, I do not ever consciously insert an agenda into my stories. I simply try to tell a good story, full stop (yes, art for art's sake, if you like). When I do that, what is important to me is inherent in the material in any case, because as you correctly point out, all storytelling is political, regardless of whether it is intended as such. The strong beliefs of many famous authors are also inherent in the material in the greatest of stories that touch on the most important of issues. I write about this principle in more detail here.

My biggest issue with The Falcon and the Winter Soldier was the uneven narrative structure, not the politics. Nonetheless, I do think it got too preachy in the finale. That doesn't mean I disagree with the message, or endorse the status quo in any way. It really isn't a for us/against us situation when it comes to criticising storytelling technique. It is entirely possible to think storytelling is poor and still agree with what the author was trying to say.