Certainly some papers are better written than others. But sometimes a blog post cannot replace a paper, unless it also goes into the depth and detail that formalism requires. (Then it becomes a 30 page blog post, where most people don't read past the intro.)
You can have both and weave them together into a digestible narrative. I see Physics textbooks sometimes written this way.
If you just wanted a digestible intro then you would usually buy a textbook.
I think the argument that every research paper ought to be a mashup of a textbook + the actual research to be a bit silly from a “people should specialize at what they’re good at” standpoint.
Put in another context, I also don’t want every recipe to reintroduce what it means to “fry” or “braise” or “marinate”. We have Google for that.