> The actual important thing that we hardly ever get much visibility into is - how many potential failures were called out by how many people how many times.
I'm not sure that's important at all. Every issue raised needs to be evaluated independently. If there is strong evidence that a critical part of a space shuttle is going to fail there should be zero discussion about how many times in the past other people thought other things might go wrong when in the end nothing did. What matters is the likelihood that this current thing will cause a disaster this time based on the current evidence, not on historical statistics
The point where you "have to make a move" should only come after you can be reasonably sure that you aren't needlessly sending people to their deaths.
I'm not sure that's important at all. Every issue raised needs to be evaluated independently. If there is strong evidence that a critical part of a space shuttle is going to fail there should be zero discussion about how many times in the past other people thought other things might go wrong when in the end nothing did. What matters is the likelihood that this current thing will cause a disaster this time based on the current evidence, not on historical statistics
The point where you "have to make a move" should only come after you can be reasonably sure that you aren't needlessly sending people to their deaths.