> your delivery guy doesn't just dump everything on the doorstep as quietly as they can?
Never had that, no.
> Or for anything requiring a signature (actually, can't remember the last time I had that through Amazon)
They email & show in 'my orders' numeric codes to give the driver who then enters and verifies them. (This verifies they actually delivered it too, since they don't know the code, just enter what you tell them.)
> run up and stick the "customer wasn't home" sticker on the door without even trying the doorbell or knocking?
You get stickers on your doors? Here in the UK (with any courier) it's a piece of paper through the letterbox that says missed/with a neighbour/in your safe place/whatever.
I suppose that's because you have mailboxes outside with little flags rather than letterboxes in doors, so they don't want to try to deliver to your door and then look for that as well when it doesn't work, easier just to stick something on the door where they already are?