That's a big reason why the hand-wavy stuff is nonsense. The limitless number of exceptions will add a ton of cost, and instead of grunts in trucks you'll need an army of analysts and developers.
For durable packages there's no technical reason the drone can't sling it between the roof and rail and it's not like delivery drivers don't routinely lob small packages not marked as fragile. Considering how fun to test that one would be I doubt the team responsible is gonna let that feature request ticket sit around collecting Jira dust for long.
Oh theres lots of things stopping a drone delivering a package to my porch, including but not limited to me, I dont want Amazon's drone blowing junk all over the place on my front porch, messing up door decorations, flower pots, whatever it is. Getting caught on a branch, a gust of wind blowing it into a column and causing property damage, my dog grabbing it (my dogs catch birds in the yard, they will certainly hunt this thing). I know the ideal scenario from drone delivery is magical but reality is had, same with autonomous vehicles.
