What it was for
XP's most misunderstood practice was never about two people sharing a keyboard. It was a quality and knowledge instrument: a driver thinking tactically, a navigator thinking strategically, errors caught at the moment of creation, and expertise diffusing through the team as pairs rotated.
The verdict
TRANSFORMS — and more gracefully than almost any other practice, because XP accidentally designed the role split the engine needs. The driver seat goes to the machine: tactical, fast, syntactically tireless. The navigator seat — intent, direction, catching the wrong turn before it compounds — is now simply the job description of a software engineer.
What changes
The discipline of the navigator becomes the craft to train deliberately: stating intent precisely, noticing drift early, knowing when to interrupt the driver and when to let a revolution complete. Human–human pairing survives for what it was always secretly best at — transferring judgment between people — and becomes rarer, more intentional, and more senior.
The strongest objection
Navigating an agent is not pairing; a pair pushes back, and the pushback is where the quality came from. Partially conceded — current machines disagree too little. Which is exactly why the navigator's scepticism must supply what the driver does not: the engine rewards engineers who argue with their tools.