Jaba,
That would be an entirely logical and coherent reason, so that cannot be the reason.
Having more than a few hours on kero burners, I can demonstrate how to vary endurance remaining greatly, at low level.
In practical terms, a hamfisted pilot can make a nonsense of the fuel remaining, almost whatever "the rool", but I seriously object to <45 minutes in tanks being a strict liability criminal offense, I will go along with <30 minutes as the figure, but NOT as a strict liability criminal offense.
ANY alleged offense in this area should, at most, be a civil offense, if the circumstances are serious negligence under ALL the circumstances, that should be the charge, but CASA doesn't like that, because it is too hard to prove to a criminal standard of proof.
Tootle pip!!