backof thedrag
On the other hand a 747 may not be able to get the flaps out in time with any more than 160 to 4.
You obviously have not flown the queen of the skies - flying 160 to 4 only required you to lose about 10 knots to landing speed at normal weights. Reducing in calm conditions of Vapp of 120 kts in icing is MUCH more difficult in a light A319, for example.
wrt to smaller Airbuses which I now fly, it is true the Groundspeed mini when in managed speed will add a lot of knots to the Vapp spped when the spot wind is much different. However, I think personally that a lot of people misuse managed speed in conditions of strong, steady winds. Gspd mini is there to protect against microbursts and the like - not in strong, steady direction winds. If the wind direction and speed are steady use selected speed - no problems.