When people talk about professionalism they usually don't mean it in just the purely literal sense. There's something to be said about writers who have a sensible vision and purpose in mind, tie all of the elements together in a coherent narrative, and can convey some real emotion and depth in a scene.
That said, it's all still a matter of subjectivity. I honestly believe that any person can do this; it simply varies on who else besides them likes it or gets anything from it. Now, you're adding some other things into this statement that go into a more technical realm, specifically the part about tying together the elements of a story that make a coherent narrative. I don't know about you, but I see BW failed at this. I also think they didn't have a sensible vision or purpose as the trilogy went on; They were stumbling about and came up with a broad enough theme to tie the series together in a rather weak manner. And I didn't see a lot of the depth in many of the scenes. It was there for many, but not there in all of them. Same for a lot of the emotion. Too much of it comes across as forced and hamfisted. It's not real when it's contrived, and that's how I felt about it for much of the time.
It's art: art does different things for different people, and people are stimulated differently from different things. Essentially, the only thing here that really does separate a professional from the amateur is the paycheck.