Same here. Frankly, I don't care about Saturday deliveries. Parcel integrity, that's a different story.
Saturday is usually the one day I can get my packages, so I hope the post offices stay open even if they do not deliver.
My local PO is open most days from 10 AM to 3 PM, which works poorly for me as I'm at work those hours.
As for parcel integrity and how well the USPS performs, I find the USPS is still one of the best, most reliable delivery services in the world. I personally dispise Fedex SmartPost, which works with the USPS, as they move things at a snails pace. Anything sent Priority Mail gets where it is going fast enough to suit me, for over ten years. If you don't like how a package arrives then pack better or tell the sender to - these things are loaded into large containers and may shift in flight or along the roads. I find UPS (which is not in any way affiliated with the USPS or federal government services) has a pretty average to below average record of delivering packages intact and undamaged - if you ship by USPS you may assume 1,000 pounds of books may sit on your box at any given time - the bulk of their business is Business, not residential.
My background has included work in the logistics and shipping industry, and a mighty good education it was. To many people how their mail or parcels are handled are completly invisible to them, assumed the worst, no matter how you ship. Twenty five cents worth of reinforced tape and good packing skills are a small price compared to value of contents or time lost due to damage or lost items. Make that label visible and pack one inside, in case something does damage the original label.