Two senior engineers have been disagreeing about the authentication service architecture for three weeks. The arguments are detailed, technically sophisticated, and mutually incomprehensible to anyone not deeply familiar with the auth service. The meeting where the disagreement was raised has been adjourned twice. A third meeting is scheduled. Neither engineer believes the other is wrong in a factual sense — they both know the technical facts. What they cannot agree on is which architecture is better.
The disagreement is not about technical correctness. It is about which costs are acceptable. One engineer weights operational simplicity — the architecture should be understandable to any engineer on call. The other weights consistency guarantees — the architecture should never return stale session state. These are both legitimate values. They are in tension because the architecture that is simplest to operate under emergency conditions is not the same architecture that provides the strongest consistency guarantees.
The disagreement will not be resolved by more analysis. It will be resolved by naming the tradeoff and making a deliberate choice about which value takes precedence in this context.