So what we're saying is the on time performance of the A380 is king. Never mind the aircraft waiting at the holding point burning fuel.
Vacating at A7 means the difference between getting a departure or maybe two away, or none. This means up to an extra 3 mins for each aircraft waiting. If there are 5 aircraft waiting, cumulatively speaking that's 15mins of delay with engines running.
When an aircraft says they require something, that means it is not negotiable, they will roll to the end. It is not the byproduct of my lazy ADC as some wizards have assessed.
I also understand the frustration regarding the placement of the high speed exits (particularly on 19). Aircraft missing the high speeds is something we battle with every day and is probably the largest cause of go-arounds.
I think it's reasonable these aircraft vacate at A7