A) Shipping by airplane is far more expensive than shipping by rail, hence the higher prices for air service v. ground service levels. There is a financial disincentive in providing the service level you've just described (east to west coast overnight) when the standard alternative is far more cost effective.
B) The additional costs of itemizing all packages by delivery guarantees and resorting, reloading, retaining and storing those deliveries is far less efficient than simply sorting them the first time, delivering them and getting them out of your system.
C) With multiple shipping providers operating domestically, the incentive to provide competitive time frames is crucial. Why would a company intentionally inhibit their ability to provide competitive transit times when the last leg (final delivery) is readily available?
Your strategy is not a viable one in the shipping world.
If I'm reading your post correctly, you're essentially making my point.
I understand the fact that I paid for ground service, and ground service is what I got. I'm not expecting a package to come to me early simply because I think I'm important or because I'm impatient. To me, it makes no sense to sit on a package for the sole purpose of meeting the original arrival date. Instead, if a package is near it's destination, it makes more sense to simply deliver it, and, as you say, get it out of the system. That is my whole point.
Please let me be clear, I am in no way asking UPS to treat my package as special. I do not expect UPS or anyone to drop my package early because I feel I am entitled to it. Far from it. Once UPS has my package, I know, based on their track record with me, it will get to me when they say it will get to me, and it will come in one piece. I am happy with them and their service. Yes, I get impatient when I get a new piece of gear... who doesn't? I am simply trying to look at this and other deliveries in a logical perspective and that's it.
BTW, I have had USPS, and I believe FedEx both quote delivery dates at the beginning of the shipment, but as that date drew near, it changed, because they were able to get it to me early. In fact, I had a package come yesterday, a day early, from USPS. If it's possible to deliver early, with no extra strain on their end, I don't see why they don't/won't do it. Do I expect it? No. Would it be cool? Absolutely.