villas,
What gun?
If you are landing in 30 minutes all that you say is not going to happen and as it is imbalance during landing is not life and death situation in airbus.
You are missing the point about potential fuel starvation and intelligent fuel management.
Assume Fuel Loaded = 4,400 kgs i.e. 2,200 each side; and assume No 1 EFTO & 30 mins flying before ready to commence approach. Assume 1400 kgs was consumed (Therefore No ECAM warning yet)
Fuel distribution would be 800 LHS; 2200 RHS
Fly approach & GA and consume say 700 kgs before aircraft clean and MCT set.
Fuel distribution = 100 LHS; 2200 RHS.
Who would you rather have if you were a passenger, pilot A (who might do ECAM during the approach & GA when work load is high) or pilot B?