The 321 wing has always been too small, indeed there are a couple of areas where I believe the regulators should have taken a firmer hand during certification. If a heavy 321 suffers a problem on departure and requires an immediate return then it is impossible to slow to below flap limiting speed without disconnecting the autothrottle.
Now I know the old folks on here will say 'so what'. Just bear in mind that many operators prohibit the diconnection of autothrust during normal flight as its considered too dangerous.
Had I been the certificating authority then I would have send Airbus away to put in a few more flap rivets and then return for another go.