Developers review pull requests. They define new tasks. They handle the decisions that require judgment rather than execution. They set the direction and the standards.
What they stop doing: manually writing boilerplate, handling mechanical refactoring, updating tests when interfaces change, maintaining documentation as code evolves, and any other category of well-defined engineering work that AI can execute reliably.
The time freed up goes toward architecture, product decisions, and the engineering work that actually requires judgment. This is the shift from intelligence work (rules-based execution) to judgment work (decisions that require experience and context).