So weird. I get really upset that they don't knock or ring the bell. I can easily miss a phone notification and then my food sits out there getting cold and soggy. IDC if they wait or not, but I need to know that the food has arrived and the easiest way for them to notify me is to spend 2 seconds reaching out and ringing the doorbell. It's easy and costs them nothing, but only about 1 out of 20 will actually do that despite explicit instructions to do so.
Tbh what's worse is when they fucking call because they can't find your apartment but then they're standing literally outside your door.
Ringing the doorbell and leaving is fine, but if I've specifically instructed no contact waiting at the door or calling (when they've made no effort to look) is pretty annoying.
It seems that they're just going to do whatever the opposite of our requests is. Try telling them to ring the bell. That's what I do and they almost never do it.