The Planner-Executor Pattern Is a Tooling Problem, Not a Strategy
The 'Planner-Executor' pattern, where a human provides a step-by-step plan for an AI to execute, is a symptom of a tooling gap, not a sustainable agentic strategy. While some frontier models are demonstrating long-term autonomous capability, practitioner tools still force engineers to act as an external executive function. The real metric for progress isn't task completion, but the Mean Time Between Required Human Interventions (MTBI).