I dunno, the only package issues I ever had were FedEx. Maybe regular FedEx is fine, but FedEx Ground sucks the big one. It's independent contractors that do the package delivery and for me, every time it has been a nightmare. I've never had issues where I live with USPS, UPS or DHL.
Some of the issue may be due to the same issues that everyone in every career is facing lately... not enough staff, unreasonable productivity demands, etc leading to lots of burnout. I mean, half the grocery store is recalled due to listeria now, Amazon workers pissing in bottles because they can't take breaks, people going hungry because they don't have time to take a lunch break at their 60-hour per-week job that still only barely keeps their head above water and all this ass-busting still can't afford them a house, etc.
Shipping in particular has had a hard time since everyone started ordering everything online now, package delivery shot up dramatically over the past decade or so.
The only time I don't bother tracking a package, there's this super cheap option from USPS, but it can take forever to get your packages (I don't think SP uses or gives this option), but that's because it'll go around to a particular hub, but then it'll sit there forever until a truck headed in the right direction from said hub is full. They treat it like a side-quest where the package is picked and pulled if someone happens to be already going that way or if they happen to have some space. Though again, not very many people offer this shipping option. It's called Ground Advantage, though depending where you live, that could be just 5 days instead of 3, though other places it's more like a month instead of 5 days. Just depends how far it has to go.