I disagree. Whether the prior occupant or the property management company has extra sets of keys, you generally don't want some random prospective tenant out there to have the keys to a unit that you will eventually want to rent out to another individual. For Airbnb's/STR's, same problem; guests returning to a unit much later to carry out illegal activities is rather well documented at this point. Across the board, it's not worth the logistical pain and/or liability risk. In the case of a prior tenant, you generally know who the person is...etc. There are edge cases for sure (e.g. evictions) but it's generally less risky.