Yep. It has kept some major accounts from switching to FedEx to appease the customers greed of getting everything right now.
I know for a fact that Walmart, Target and Kohls wanted us to deliver their packages on Saturdays, just like FedEx would.
These companies are in competition with Amazon. Amazon delivers on Saturday. These companies wanted their packages delivered on Saturday also.
The effects of change. If FedEx, Amazon and the USPS quit delivering on Saturday, we probably would also.
Hell, Sunday delivering will be coming.