I personally am fine with this.
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That’s bad advice
Is it less secure than it could be? Yes.
Is it better than no 2FA? Also yes.
In the end if it doesn’t work for your security model, than more power to you. But if it helps to increase the security of the average Joe, it’s good advice.
Allowing a smartphone access to anything sensitive is even worse advice. Smartphones are notoriously insecure.
You’re right. Dont grant your smartphone access to your GitHub. Just give it one factor.