Gives airlines the freedom to not load luggage for operational reasons (plane too heavy, high paying cargo shipment became available very recently, fuel at this

Gives airlines the freedom to not load luggage for operational reasons (plane too heavy, high paying cargo shipment became available very recently, fuel at this airport too expensive) and pretend it was a simple mistake to avoid (rightful) customer outbursts about being singled out. Airline staff can probably see as much on their screens but not allowed to share.