They get it all the way to the porch? I've had USPS people leave packages in the driveway because walking the 25' feet from the vehicle to the porch is too much to expect.
The incentive structure simply isn't set up to reward a delivery driver taking that extra effort. In fact, it explicitly punishes it.
Biggest reason to leave a package at the driveway is a fence/gate. A fence keeps stuff in or out, either way, not respecting that is how you end up with stories like this: https://www.khq.com/news/responders-ram-driveway-gate-to-sav...