Suppose you owned a business on a busy thoroughfare and had to close early that day for a family emergency. Your driver is unable (or can't be bothered) to indirect the package so he leaves right by your locked front door for the whole world to see. Would you be a happy camper when you come back to see the package sitting there or, even worse, find out that the driver had just left it there and it is now missing?
Yes, the DIAD says you can leave a shipper release anywhere, but do you really think that they meant to include "at the front door of a closed business on a very busy street"?
I would much prefer to get "talked with" than have a customer
that I couldn't be bothered to take care of them.