In practical terms, headship determines decision routing.
When two people disagree, someone must carry final responsibility.
Without headship, disagreements become negotiations without end.
With headship, disagreement can exist without structural collapse.
That does not eliminate conversation.
It defines resolution.
When the wife overrides final decisions repeatedly, she is not correcting incompetence, she is destabilizing office.
When the husband withdraws under resistance, he abandons office.
Both produce disorder.