On a commuter flight with a 10-20 minute turn around time, deplaning speed is definitely relevant. Not many bags are being checked anyways, and the next set of passengers is already in line waiting to board.
On any flight > 1.5 hours or on a plane bigger than a 737, your point holds. On a 11 hour international flight via a 777, deplane speed is really unimportant at all.
On a commuter flight with a 10-20 minute turn around time, deplaning speed is definitely relevant. Not many bags are being checked anyways, and the next set of passengers is already in line waiting to board.
On any flight > 1.5 hours or on a plane bigger than a 737, your point holds. On a 11 hour international flight via a 777, deplane speed is really unimportant at all.