The OpenAPI Specifications are designed to be robust enough to capture the behavior of various types of APIs, including RESTful and RPC-based calls. The key to leveraging OpenAPI effectively is to be explicit in defining data types, formats, and validations. This clarity is crucial for API documentation and ensures that tooling can generate code and insights predictably. By following recommended practices such as being explicit, validating ruthlessly, planning for tooling, and using standardized formats, developers can create robust and versatile OpenAPI specs that support a wide range of APIs.