Quite, so here's a hypothetical...
unexpected delays for some reason, let's say a burst tyre. Middle of the day, nice weather, nobody expecting much holding. First pilot chimes up minimum fuel, 'roger, delay 10 minutes' says ATCO, no priority given or expected by director or by tower in doing best to ensure no go-around. Another pilots adds minimum fuel, still no priority to either. Perhaps another... At what stage, if at all, do we have to decide that these are all committed, and that should anything untoward occur, perhaps with a departure, there may now be 3 or maybe more immediate MAYDAYs with perhaps little prospect of reaching an alternate. Are departures stopped, queues jumped, or still carry on and hope nobody ahead stays on the runway for any reason...
If, as a pilot, you hear a couple of minimum fuels declared and you are getting that way too, do you decide diversion now would be a better option? Imponderables????