Airbus allows the flight crew to manually adjust Vapp to compensate for wind effects that GS mini is not well-tuned to capture. GS mini works best in steady wind gradients and normal gusts, but sometimes gets a little behind phase in sudden shears. This is really going to be environmental based on conditions or local knowledge, and as previously stated not to adjust a faulty landing technique on a calm day. To quote Airbus:
“
In some situations (e.g. gusty conditions or strong crosswind), the flight crew may choose a higher VAPP
than the AFS computation as good airmanship”.
https://safetyfirst.airbus.com/contr...h-and-landing/