> You establish a pool of long lived connections per backend Yes, and you would do the same with HTTP/2. You haven't addressed the head-of-line blocking proble

> You establish a pool of long lived connections per backend Yes, and you would do the same with HTTP/2. You haven't addressed the head-of-line blocking problem caused by HTTP/1.1 pipelining, which HTTP/2 completely solves. Head-of-line blocking becomes an increasing issue when your HTTP connections are long lived, such as when using websockets or large-media transfers or streaming.