This blog post argues for the benefits of header files in C and C++, suggesting that separating public API declarations from implementation enhances software design practices. It critiques modern languages that collapse header and implementation files, claiming that the separation of interface from implementation is key to managing software complexity. The author proposes an updated version of header files that improves upon C and C++ practices, while exploring potential tools for automating header file generation and discussing the importance for versioning and maintaining API stability across projects.