This so much. USPS is literally the worst service I have ever used. If I see an Amazon package switch over to USPS I immediately email and get them to send it again and switch it to FedEx or UPS. You're right though that it is becoming harder to get them to switch it back to a delivery service that actually cares about delivery.
Weird. UPS has always been the worst. I'd say about 50% of UPS packages either get misdelivered or marked as undeliverable for me. The numbers on my street are a little odd, but it's not that hard to actually find my house, and it is listed correctly on Google/Apple maps. No matter how hard I try to get UPS to get on the ball and fix their mistake, nothing ever changes.
This so much. USPS is literally the worst service I have ever used. If I see an Amazon package switch over to USPS I immediately email and get them to send it again and switch it to FedEx or UPS. You're right though that it is becoming harder to get them to switch it back to a delivery service that actually cares about delivery.