I am surprised that the Captains of today even go along with this.
On one of the Overseas contracts I did many years ago now, Aussie aircraft and Crews, we had a new Station Manager arrive during the contract and one of the first things he told me was that he was going to do all the flight plans and tell the Crews how much fuel they were to take.
I told him I did't think it would go down well with the Captains, and big surprise when he started doing this EVERY Captain on EVERY flight ordered more fuel until common sense was restored.