Probably why one of the books I ordered from Amazon were left out in the pouring rain - returned for a replacement, and hey presto, that replacement was left outdoors as well, in the rain.

At least with Royal Mail they used to leave at the delivery office in the dry, but the recent trend { since Covid era} for dumping stuff on the doorstep is really not good.

However, It does depend on the driver. 

Some Evri/Amazon couriers do  knock rather than dump and run, and one kind driver helped carry a heavy item into the house.