Too bad they don't do OpenPGP like Yubikeys do. I still need that even more (much more!) than Fido2. Sites are so slow adopting Fido2.
I don't use it for email but I use it for SSH and my password manager ("pass"). And yes I know SSH can use Fido2 natively as well but there's many embedded SSH daemons that don't support that yet.
Luckily Yubico is still around but I'm betting on them going down the drain (subscription models etc) soon because they were taken over by a venture capital firm :(