It's had head of line blocking, proxy, and load balancing complications in the past, no? It's annoying to pipe it over Http 1 and get it working in browsers or

It's had head of line blocking, proxy, and load balancing complications in the past, no? It's annoying to pipe it over Http 1 and get it working in browsers or older runtimes. It's still not easy to make it work in Unity, for example. Http/3 solves it but that's not always available even today.