The crux of the argument is what should a line Captain be teaching. If the line captain has to teach basic aircraft control or IFR procedures, then that is an issue. If the FO needs to learn about ADM or specific stuff related to the operation of a complex aircraft, then that is normal.

In the last two weeks, I had to teach one FO which climb profile to use for the current conditions. I didn't mind teaching that because it was something that is specific to our operations and is not covered in training. One week later, I had to fly with an FO who did not understand how to enter a VFR pattern. I found myself explaining multiple times that we were entering a 45 to the downwind to an uncontrolled field. He was confused because a straight in to the other runway was easier. Now I am on the base leg explaining that we could not land on the other runway because it had a 12 knot tailwind (and yes, 20 minutes before this, I briefed what I was going to do). 24 hours later, the FO was still confused about my "unorthodox" pattern.