I don't think it's quite what you were asking, but I always avoided Two Factor Auth because I don't use a smartphone and all the approved methods seemed to use phone apps.

A year ago, one of my accounts forced me to enable two factor auth, so I spent time looking into how to make it less onerous. Turns out the TOTP code stuff is an open standard and there is a command line tool [1] you can use to generate the codes.

Thought that was really neat. I wrote a little script to integrate with my password manager and went from avoiding two factor auth to enabling it everywhere.

[1] https://www.nongnu.org/oath-toolkit/oathtool.1.html