USPS has been this way for years. I personally for my own internet shopping do not ship anything USPS unless I'm willing to have the package go missing entirely. If it's important or a costly item then it has to be FedEx or UPS.
For several years, Viking actually removed USPS as a shipping option. Many, many angry customers left nasty reviews regarding Viking as a company - due to USPS not performing - something that's completely beyond our control. We do our part, pack it up, print the USPS label, and hand it off to the USPS. Our experience, even in the non-holiday season, is that Priority mail takes about 3-5 days, and Express mail takes 2-3 days. Around the holidays, USPS priority mail can take several weeks to be delivered. And overall the percentage of completely missing USPS packages is about 1 in 100 go missing.
FedEx by comparison will go 1,000's and 1,000's of packages before one goes missing.
But then customers left angry nasty reviews about Viking as a company because our shipping was too expensive (since we only offered FedEx and UPS but not USPS). So we re-instated USPS as a shipping option, but now we are back to receiving complaints about being a bad company (when the fault lies with USPS).
Can't win :-(