> Maybe your phone doesn't have banking and stuff on it

I don't know where you live, but where I am most banks insist on proprietary 2FA via their own app. Only (some of) the fintechs allow TOTP.

Yes you can get your codes via SMS, but I thnk we all know what a security mess SMS is. I would rather have the bank's proprietary app since at least everything will be going over HTTPS and also eliminates most of the vulnerabilities associated with SMS just by virtue of being an app.