how you people who work all day manage"
It's not easy, I'll admit, but Amazon packages go into my paper recycling bin, which is always clean and dry. We didn't ask for that to happen, but it seems to be a convention, as several other people have reported the same thing.
Courier drivers have a difficult job to do, lots of people aren't in, and lots of people make odd requests to have packages left under cars, with neighbours, by the holly bush in the front garden etc., none of which the driver is technically allowed to do. Couriers know that there are people out there who will subsequently deny receiving the goods if they don't sign for them, so they tell drivers to stick to the rules.
Some drivers don't, and I've heard lots of stories about packages being left in the open for others to steal a leisure.
Nobody's perfect, and I'm certainly not an apologist for the Couriers, but consider their side of things for a few moments and I'm sure you'll realise that it's a pretty thankless task at times.