Hi vilas,
I'm not so sure it is the impact on the wing Airbus is concerned about.
The QRH says:
"When committed to land, set 5 degs rudder trim towards live engine."
This is the only procedure I have found which specifies the amount of rudder to be set and uses the words "committed to land". (No GA)
I suspect they are concerned about rudder authority with high thrust on the operating engine + drag on the opposite engine and low speed.