I suppose the thing that most annoys me about it is that the post office is really struggling to keep itself afloat... so this is hardly the time to make a bad impression.
The USPS used to contract deliveries for Amazon out here, but the USPS trucks (at all hours) have now been replaced by actual "Amazon Prime" vans that start circulating at 7:00am and are still out and about at 8:00pm. You can say what you will about Amazon, but they do have the whole delivery thing dialed in.
We run a couple of small businesses that involve shipping, as well... and my wife has a Poshmark store (clothing) for shits and grins, and I pretty much take our packages on days when we're going to the stores in town, anyway. It's easier to just drop the boxes at the post office than wait around for a pickup. We still use the USPS because... well, Priority Mail is still one of the best deals going, for many different shipments.
I expect the situation will change soon because we have both a Sheriff and a retired state legislator living in the neighborhood. When Wave Broadband (the local cable/Internet provider) had their Nth multi-hour service outage during the NFL playoffs... well, let's just say that three days later there was a small flotilla of Wave service trucks in the neighborhood completely recabling all the main lines.