Wish I could say the same. I ordered a case last week. It was mis-sorted... UPS didn't take action until I called and asked why there was a 3 day pause in tracking when it was supposed to be delivered 2 days before. They realized it must have been lost, and issued a trace. They ended up finding it and delivering it today, 3 days later than promised by Apple AND UPS... so to say the system "just works" 100% is absolutely inaccurate.
Furthermore, if you get the tracking info once the package is loaded on the truck, it's too late to hold it. Had an order from Apple where they sent the tracking number the night before on an overnight package, and by the time UPS opened at 7 am Eastern, they were unable to have it held because the truck was loaded at 3:15 am.
So yeah, I don't think my concern is unjust. Clearly others are anal about the tracking as well given this thread is 200 pages long after 10 days. Sheesh.