At all points along the flight you must have your reserve and any holding be it traffic or weather available.
thats patently wrong. Only on departure must you all those things. What you say makes no sense. If you hold fuel say; because Brisbane or Sydney requires it for congestion reasons, and you get slowed down and asked to hold,
that’s why you took that fuel you can burn it in the hold..if you hold fuel because of an Inter or a Tempo and the weather develops ahead..you are allowed to hold until the weather passes burning that fuel because
that’s why you took that fuel