isn't that kind of.. debugging? i.e. digging up the reason why something had happened although that one is about (past) reality, while OP one is about (specul

isn't that kind of.. debugging? i.e. digging up the reason why something had happened although that one is about (past) reality, while OP one is about (speculative) future maybe more like estimating of impact, requirements-wise, following a traceability chain.. what would break/change if this is changed?