I remember my brother having a printed list of one-time-codes. I wonder why this is not mentioned? Not everyone wants to have their phone a single-point-of-fail

I remember my brother having a printed list of one-time-codes. I wonder why this is not mentioned? Not everyone wants to have their phone a single-point-of-failure. For me - breaking screen in my phone rendered my banking unavailable for me, which posed additional problem on how to pay for the screen replacement, not speaking about buying food etc.