I took a short break recently to see a friend I haven't seen for 20 years. The Nokton had just arrived, and I had no idea about this focus shift stuff. I took just the Nokton and my MP.
Usually, I like to shoot close to minimum focus, which is 0.7m for most lenses, so I find that one aspect a bit limiting on the Nokton. I live around f2 to f4, and would only go lower if I absolutely had to.
My shots came out fine, and I had no idea about the focus shift until reading this thread. I'm not about to beetle off and test it either!
So, for me, I took the Nokton as my only lens to an important occasion, and it came up trumps.