I worked for a Dpd subcontractor. Most heavy parcels and routes are given to sucontractors. 120+ deliveries at a 2min/delivery. Some parcels are over 25kg or combined can reach 100kg or more (4x15kg or 6x10kg or 10x10kg). Most of the customers are ok. A small part of people don't know or want to use dpd app properly and can't be bothered to answer even if they are in. Sometimes it looks like they want to take 2 minutes to open the door. When something goes wrong it is easier to blame the driver. If it's foreigner better.