They deal with prolly a million packages a day. Calculate the logistics for each penny in efficiency. They may drop the ball occasionally (I had a laptop go missing for two months with fed ex) but considering the sheer scope of operation I disagree with the sentiment of some of the other users and consider the parcel deliver business fairly amazing from a logistics standpoint and business model.
Absolutely and utterly irrelevant. When you enter an agreement to deliver a packgage from 'here' to 'there' arriving at 'this' time on 'that' date, you have a cotnractucal obligation to do so. If for some reason that obligation cannot be met, than the "deliverer" had best be making with the apologies and refunds. Saying that a package was left on a truck and delivery will be "reattempted" is rubbish. You get that package, you contact the recipient, and you send it out at THEIR convenience.