Exactly how does this work in the real world? Given how competitive everything is, I would think every minute of effort diverted from a primary specialty toward a backup is going make it more likely that the backup is going to be needed, creating a vicious self-fulfilling prophesy that only the least confident gunner among us is going to be willing to indulge.
If someone lacks the self awareness to realize they are not going to be competitive for ortho until a Step 2 score is released, I'm not sure they are going to be smart enough to be hedging their bets from Day One. And if they possess the self awareness, then they are not going to be needing a backup in the first place.
I'm just beginning this journey myself, but, from what I've seen so far, I have a hard time believing high Step 1 scores come out of nowhere and are a shock to those receiving them. Similarly, I am going to have a hard time believing Step 2 scores are going to come out of nowhere for the vast majority of people.
Most people perform at a given level all along, P/F or no P/F. This goes for pre-clinicals, rotations, Step 1, whatever. If a low performer wants to delude themselves into thinking they are competitive for a highly competitive specialty because their middling performance is masked by P/F, only to be exposed at the last minute by a middling Step 2 score, I wouldn't know what to say to them. But I would think they'd surely be setting themselves up for failure by hedging their bets from orientation forward.