I have an issue with using ID.me for government websites, because it is a privately owned company. Online authentication at this point seems as important as USPS service and warrants being owned and developed by the government itself.
ID.me supports WebAuthn (or maybe U2F? In this context it doesn't matter) but importantly it does identity verification so it can determine whether I am a US citizen, whether I'm a tax payer, and if so which one.
Now, perhaps the US Federal Government should own the capability to do that instead of a private company. But, so far as I can tell, they do not and login.gov is not such a thing.
https://www.theverge.com/2022/1/26/22903437/id-me-facial-rec...
-Mario
Login.gov also supports WebAuthn.