The article discusses the author's experience with building an AI coding app called Nuanced, which focused on planning as a key part of the software development process. However, the author found that the approach to planning used in Nuanced was not effective, and that the need for explicit planning is decreasing as AI models improve. The author suggests that the traditional concept of a 'plan mode' is no longer necessary, and that a more fluid and iterative approach to planning and development is needed. The article explores the challenges of working with AI models and the need for new interfaces and workflows that can effectively support human-AI collaboration.