airdualbleedfault, the aircraft on final is not the only restriction for departing aircraft.
Sequences get changed, for instance because an aircraft didn't meet it's stack departure time. You depart 30 seconds early & they depart 90 seconds late & you've got dead heat at the threshold. Who are we going to pick to try & fix this? The guy we think will win. So of course he gets maxxed up to try to reduce the bloody great gap in the sequence.
Be creative? Can you be creative with operating procedures on the flight deck? Fine until somebody f@#ks up & then it's crucifixion.
Movement caps aren't decided by operational controllers. We just get to work within those constraints.