The choice between REST, GraphQL, and gRPC is treated in most discussions as a question of technical preference when it is primarily a question of context. Each protocol was designed for a specific problem space. Each performs well in that space and poorly outside it. The comparison articles that declare one winner across all use cases are either selling something or have not operated all three at production scale.

REST’s dominance in public API design is not accidental. The constraints it imposes — statelessness, uniform interface, resource-based addressing — map naturally to HTTP’s caching infrastructure, client library ecosystems, and the mental model that most developers already carry from web development. A REST API can be consumed with curl. It can be documented with OpenAPI. It can be cached at the edge. These properties have real operational value that architectural elegance alone cannot purchase.