When did Amazon prime resort to UPS SurePost? {Necropost}

StrangerDanger thought this was worth mentioning said
15

Short rant, so Amazon now uses UPS SurePost (UPS hand off to USPS) to deliver prime packages. I expect this from Meh, cheap stuff, slow shipping. But I pay $100 year for fast shipping. So now the package I ordered got to the mail hub in 2 days but will have to wait another couple days for a delivery attempt. Then take off from work early to race to the post office since they won’t deliver anything that won’t fit in the mailbox. All support says is sorry we’ll let shipping know that you were not satisfied. Am I blowing this out of proportion or an I right to feel ripped off?