I read the federal government’s Zero-Trust Memo so you don’t have to

This is pretty incredible. These aren't just good practices, they're the fairly bleeding edge best practices.

1. No more SMS and TOTP. FIDO2 tokens only.

2. No more unencrypted network traffic - including DNS, which is such a recent development and they're mandating it. Incredible.

3. Context aware authorization. So not just "can this user access this?" but attestation about device state! That's extremely cutting edge - almost no one does that today.

My hope is that this makes things more accessible. We do all of this today at my company, except where we can't - for example, a lot of our vendors don't offer FIDO2 2FA or webauthn, so we're stuck with TOTP.

What's wrong with TOTP?

I was wondering the same thing - here's an article I found that describes both approaches. Not being in the cryptography space myself I can't comment on how accurate it is, but passes my engineering smell test.

https://blog.trezor.io/why-you-should-never-use-google-authe...

Edit - sorry that this is really an ad for the writer's products. On the other hand, there's a hell of a bounty for proving them insecure / untrustworthy, whatever your feelings on "the other crypto".