Reading the comments on this subject, I realise that many captains are now very decided to save some pounds of fuel at all costs. Accelerating like a slingshot...sent a shudder through my old spine. Reminds me of gung-ho captains in my company who kept more than 300 knots until interceepting the localizer, when the controller agreed, "to save time for the company"...then would wait twenty minutes for the stairs to reach the aircraft because they were early at the block...
More important...Va is 250 knots on the A320 (or was in my days) and above VA...you do not have full deflection of the ailerons and spoilers...you have a reduced rate of roll to protect the airframe...if any strong avoidance tactics should be needed, you might hit the intruder...45 or 60 pouds of fuel lighter.But managers talk about saving fuel, so let us forget it...