Just at a guess, if you’re trying to land in an emergency then you might want as little of the stuff that might burst into flames onboard as possible.
My point was that they always seem to be carrying an excess of what they need.
So, because airplanes don’t carry EXACTLY the estimated amount of fuel on board, you infer that they carry full tanks everywhere they go? Deep thinking. Really.
The center fuel was reported to be empty or nearly empty of fuel, IIRC, for a trans Atlantic flight. I didn't infer they carry an exact amount of fuel. Are you sure you want to make your comments to me?
My comment# 64: "My point was that they always seem to be carrying an excess of what they need."
An excess of ideal fuel consumption for an expected route does not necessarily imply a full tank.