Airbus asking you to land with 5 degrees crab is another indication that the design does not prefer wing down. You don't need to look at ND to touch down with some crab, looking at the centre line ahead will suffice. The problem in landing with crab is the side load. If you land with drift it will still impose side stress. I remember in 747 classic it was recommended to land with crab on wet runway. On wet runway the aircraft initially skids sideways that reduces the side stress and then the CG position straightens the aircraft.