Why everyone thinks about single sector? An airline with a few hundred aircraft regional fleet is doing literally thousands legs each day.
Because I知 not being paid to exercise my professional judgement and command authority over all those other thousands of flights. Just the one I知 doing now, with the crew, passengers and aircraft I知 responsible for. I知 not ordering extra fuel for the hell of it, just to ensure that I can deal with whatever eventualities I think are reasonable on the day.
If you wish to carry an extra fuel every time why dont you start your own AOC?
No thanks, I値l just keep doing my job to the best of my ability, which includes ordering whatever I consider to be a safe and professional amount of fuel.