When retail stores were in downtown areas, there was tremendous congestion when people went to shop.
When they moved around to different malls, there was still a lot of congestion around the strip centers and malls (as recently as the 90s, I remember waiting thru 15-20 minutes of traffic to get into the parking lot.
Now, I bought and paid for 5 products on amazon- I didn't drive- I didn't consume gas- I didn't contribute to congestion on the roads- I didn't get into a car accident, and my car wasn't damaged in the parking lot.
Say 20 consumers shopping personally consume 400 minutes of road time-- 20 shoppers delivery shopping consume 40 minutes of road time.
The problem is the parking infrastructure will need to adapt.
There was a time when we had a mail box at every house. Now, a lot of places have 1 mail box.
Perhaps we'll end up with a big centralized delivery hub for each block. Perhaps a designated parking area for delivery vehicles.
Amazon is looking into drones.
In any case, it's not a problem in my neighborhood yet. They pull up, drop off stuff. The road is constricted but not blockded at any time. Then they leave within 2-3 minutes. This may be more of a problem for high rise condos or apartment buildings than residential neighborhoods.