Yes, it's right. Still, in some form, these should be valuable because they would help understanding what actually made a difference for the ones who did succee

Yes, it's right. Still, in some form, these should be valuable because they would help understanding what actually made a difference for the ones who did succeed. Because most of the time we just ask them (or they tell us without asking) how they did it. But they may have no idea whether what they think was the key actually was the key. In short: it could help with removing (some of) the survivorship bias.