Time
HT to Nigel's few well chosen words that allow me to cut my post by 90%: “...the multitude of warnings is unlikely to immediately improve SA”
A decision chain leading to an accident can be long or very short. The last possible chance to avoid an accident comes between the last two decisions of that chain. If the time available for all decisions or just the last two is seconds, or even virtually instantaneous as some scenarios posted suggest as possible, automation resulting in info and sensory overload probably contributes to an accident. Those are different and relatively rare scenarios compared to when pilots have enough time and automation is helpful.