I agree that there is some protection for drops. However, the expected drop in an Amazon warehouse, or a UPS shipping center is not a 20 foot one. I'd doubt it's even a 10 foot one. I've seen the insides of both of those buildings (my local ones). Things get shaken, stacked, and dropped. A 20 meter drop is ridiculous, and the logistics of getting a drone 10 feet off the ground in a city is still and issue imo.
I suppose it depends on the city, I guess in NYC where there are many people on the sidewalk it would be hard, but in Atlanta I don't think it'd be an issue, there's usually quite a lot of space.
