(2) even as a planning exercise it makes no sense since choosing an IAF in advance assumes the winds won't change, not exactly a given in real weather.
You pick your preference and go with it.
I've have never flown with this instructor, but we've all flown with "that guy". It's amazing how many "professional flight instructors" persist in teaching incorrect information despite what is clearly printed in the FAR or AIM for no other reason than that's the way they've always been doing it.Knowing the instructor in question, it's probably just one of his many "-isms" that no one knows where he got it from but he certainly won't listen to you no matter what evidence you present to the contrary.