Yes. But the key moment is "if required". With Beast you always have to initiate read and write operations. Just look at Vinnie Falco's code: https://github.com/vinniefalco/CppCon2018/blob/293bedbd5204d... You perform request processing and then you write the response manually. Even if there is no need to do such low-level operations in that task.

> And moreover, C++ is generally used in projects where such control is required.

Not only. For example, Wt framework is used for Web-interface for smart devices and you don't need to have an extreme performance here.

Another case: we created HTTP API for old C++ code, but this API was used inside a big application only (application was divided into several parts, something like microservices approach). And the main problem was not a performance of HTTP-related part, but the big response times from old C++ code (it takes seconds to process a request).