Why do residential properties treat foreign sellers differently when they enter and leave the residential area? Since it is allowed, why not let them in through the nearest door?

First of all, the residential property should be responsible for the safety of the owners, so the entry of outsiders should be strictly examined. However, the manpower of the property is very tight, and there are few security guards. They can only register in designated places, so the nearest door can't let the courier in. So everyone should forgive the property, because the property is for everyone's safety.