The first article you link says: > It is currently impossible to implement the HTTP/2 gRPC spec in the browser, as there is simply no browser API with enough f

The first article you link says: > It is currently impossible to implement the HTTP/2 gRPC spec in the browser, as there is simply no browser API with enough fine-grained control over the requests. For example: there is no way to force the use of HTTP/2, and even if there was, raw HTTP/2 frames are inaccessible in browsers. I read that to mean getting direct gRPC support in browsers is a significant effort. A large enough effort that there's currently no justification for diverting time and people from higher priority work.