Specifically, commercial type vehicles. This might just be confirmation bias, but here goes:
I had a windshield replaced a while back. Guy took about 45 minutes. He let his delivery van idle the whole time.
Yesterday I had a new refrigerator delivered. One of the guys that would have been working the truck hadn’t shown up, so the delivery guy did the whole job by himself. He was here 75 minutes. Delivery truck idled the whole time.
Now, in both cases, they were not wasting time. They were doing their job the whole time, so I have no issue that that. I just don’t get the point of letting your vehicle idle needlessly–to me, anyway.
Maybe it’s just a local thing. But I have to assume that it’s not that rare elsewhere.
(And this is not an area known for bitter temps where you have to keep your motor running or it won’t start up.)