Martini
From your attitude it seems you believe you have nothing to learn from an instructional flight.
Well, that is quite an incorrect summary of my beliefs, so I should explain it better.
I learn something from
every flight, be it solo, with an instructor on my right, or a student/certificated pilot on my left. Or behind or in front of me
Instructors have several roles, sometimes it to (hopefully) impart some knowledge to the other person, sometimes it's purely to assess the other persons flying ability. It would not be uncommon that during the second kind of flight, I would learn more from the person I am assessing than he/she does from me. It's very common during the first.
Anyway, this thread is about logging practices, not learning practices. I just think that to blindly say an instructor is always in command of a flight is oversimplifying a complex relationship.
Frankly I am surprised any instructor would want to fly with you in any capacity, let alone "sign you off"!
Seeing as you have no idea of my personal situation that is a foolish thing to say. I can put my hand on my heart and promise that you would be totally utterly surprised