I never understood how can they do that. What if someone steals it while it's standing there?
In my country, no courier can leave a package like that. The only way to hand it over is to receive your signature. If that's not available, then they return it to their warehouse where you have to pick it up yourself later.
i think there is a half way house..
i like that we often have an opton to leave with neighbour. For some things couriers guve us in the uk the option to leave in a safe or hidden place. i think if we check this box it is at our own risk (not 100% sure) but i would only do this (have only done this) with low value items.
of course if a delviery guy does this without asking 1st - my rift CV1 ended up left behind the bins in the pouring rain!!!! - then it is on them if it goes wrong.