I suppose with the citizens vs naturalized or derived citizens. But, a birth certificate is a lot cheaper. SAVE exists, so if the authorized acceptance agent can verify your identity and take a copy of the original certificate, there's no real reason to provide the original for it to get lost/stolen/damaged. Those people should be or, perhaps, could be required to be notaries.
No passport reps at mine or the kids' ceremonies. I think you're right about the post covid slim back.
I had to get an expedited passport as I had travel within 2 weeks of the ceremony. I had to call DOS and they basically said you have to suck it up and go wherever we have Passport Office appointments. Luckily, they had one in Houston but I did have to waste 2 days of my life in the Passport Office. It was nice to have my certificate back in hand because I needed it to update my NEXUS (apparently my passport wasn't good enough?).
The kids we did through the Post Office and the agent stapled my CoN. I was NOT happy. They weren't supposed to and that was reaffirmed at the kids' CoC ceremony. The USCIS agent and judge cringed when I told them that's what had happened. Technically, the certificate should be replaced because it's supposed to stay pristine, or so I'm told. That's a nope from me.