Well, I think there's a little bit of a designer in every tailor and in the early days the tailor was the designer.
Warning: Spoiler! (Click to show)
Back treatments like this aren't new, take a look at some of the old pictures of sports coats from the 30's. You'll find a bewildering range of back treatments, some functional like a bi-swing others purely decorative
Here is a pattern Taub's created for a jacket with a curved yoke amongst over features.
Don't be put off by these types of tailors, there's a tendency to think that they can't cut a conservative business suit. Most of their business is likely to be such business suits.
In some ways though they are the very definition of bespoke tailoring, in that they are flexible and willing to collaborate with the customer to make something unique and special, like Rubinacci did with your coat.
I understand that. But I think you can very safely distinguish between modifying the lines of a cut from adding features, details, lines, etc. that were never there to begin with. Also, to be clear, I would never object to using a tailor merely because he displays a few "signature" things I don't like. Taub's work looks really great--I just don't like the back yoke.