But on rotation the trim is set for takeoff power and V2.
Can you state the final authority for that assertion as I cannot find one. I guess it all depends who you ask and in turn where he got his information from. The local simulator technician maybe? A check captain who is the airline technical guru? One theory I was told was the takeoff trim setting ensures the aircraft will be in trim at V2 plus15, with one engine inoperative. If that is true, it would mean 99.99% of all takeoffs (all engines) the aircraft would be out of trim the moment VR commences?