> Amazon has been pushing us hard to switch from FedEx/UPS/USPS to using them for most of our packages
I hope that there's always a USPS option. My apartment complex has package lockers that can only be used by the USPS, so that's the only safe way to get packages delivered when I'm not home.
After shipping with Amazon for our non-Amazon orders for six months, we've moved about 80% of our shipments to them because they save us that much time, hassle, and money. FedEx picks up almost all the rest, with a handful of packages going out UPS and Postal due to address requirements, or customer preference on phone orders (all online orders are Amazon/eBay/website where we limit shipping choices; we are about 60% Amazon, 30% eBay, 8% website, and 2% phone orders on a typical day).