I suspect this is very regional. My Amazon deliveries come in a marked van, clean enough, with a uniformed driver. They have been just as personable as the UPS & FedEx drivers, they don't walk through my lawn, they all deliver packages to my doorstep just the same. But the Amazon guy does take a quick picture. Can't really just toss it and walk away.

> Reminds me of fast food employee who simply hands your meal out the window, no greeting, no thank you, no smile...

That's a sad place for sure. I don't eat a lot of fast food, but our closest restaurants are usually courteous. But that might also be partly how I address them. I decided many years ago that common courtesy just made the whole world a nicer place, whether in person or driving down the road. Even if you start out forcing it, as your mood improves so will the moods of the people you interact with, and it spreads. Bad attitude also spreads. So I don't choose that.