Well smugglers don’t really use the concept of “waybill” and “shipment contract”, they will just attach their box of stuff to the external part of the vessel or try to smuggle it within passengers’ luggage.
It will have an impact on industrial counterfeiting, since as an operator you will see “signed and approved” shipments but also “similar ones but not signed by the brand owner” requests. Then operators decide their risk tolerance.
If customs speed up compliance it will be for fully signed shipments though!