I wish all sites using 2FA would just support hardware keys instead of authenticator apps. It's so much easier to login to a site by just plugging in my hardware key and tapping its button, than going to my authenticator app and typing over some code within a certain time.

It's even sinpler than email 2fa or sms 2fa or vendor app 2fa.

For authenticator app you also can't easily add more devices unless you share the database which is bad for security. For hardware security key you can just add the key as an additional 2fa, if the site allows it.