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For 2FA, why would I want to use my phone? Certainly not SMS. YubiKey primarily, TOTP if necessary. Neither of which I need a phone for.

Most TOTP solutions are phone based, but you're right you can use them on any platform.

Some 2FA is app based, so that you'd need a phone for.

You wouldn't want to, but it's what 99% of people are herded into doing. TOTP is a lot more supported than hardware keys.