The shift  while trending for years  has truly accelerated over the past five to ten years as ecommerce was normalized. Although UPS and FedEx have been in the space for decades their networks were not necessarily ready for the change. Typically relying on the Unite States Postal Service
 USPS  for many residential deliveries  the demand for specific day deliveries has strained that model  as the USPS makes just one stop at a residence per day