Could be because they can make life easier for you if they know, or just fun
I've been driving for Amazon for a few weeks now and here's what I got
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We only see delivery instructions once we park by your building, so telling us which streets/gates to use on the way is useless.
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Also, we lose access to them once we finish the delivery (basically right after we leave the package on your doorstep) so if you for some inexplicable reason have an INTERNALLY locked gate, have the code/button somewhere clearly visible because otherwise we can get stuck (like i was for a bit yesterday)
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All that said, you can really make them useful by being clear and specific about things. If the keypad to open the gate is hidden behind some shrubbery, let us know. If it's a confusingly laid out apartment complex, tell us which way to turn as we exit the elevator because you could be the only person with delivery on that floor and we don't want to waste time walking to the wrong end of the building
To add to the "grocery worker experience"...
To customers... When I'm punched in, I'm not your friend. I don't need your life story. We can be polite with each other and cheery, but there is so much to do and so much of it won't get done anyway please don't make it worse. Every second I have to stop and "play nice" with a grown adult is less that I will get done during my shift, which will make more work for the next shift, which will make more work for me when I get back on shift tomorrow.
If you need help, ask. I'll either be able to help you or not. I will tell you this. Don't keep asking me the same question that I just answered expecting a different answer. Don't make me stop my current task, walk to the back of the store, count slowly to 30, and walk back out to tell you that "nope, the thing I just told you wasn't available is, in fact, still not available".
The grocery store is not the distributor, the grocery store does not make your frozen waffles, the grocery store does not run the farm that grows the green beans that are canned on aisle 3. The store places orders and either the order will be filled or not. If you, as a customer, feel powerless to get something from the grocery store that is out of stock, guess what, the buyers for the store don't have any more power over the distributors than you do over the grocery store.