I'm waiting for the X > Y flame war except when you need to do Z, where Y is an element of {Java, PHP}. (And to be fair, Hack is awesome in its realm except the tax barrier to entry is difficult/impossible to learn and acquire.)

Webserver centric DSLs have fallen by the wayside because it's limiting and pointless to pour -> too much <- application-layer/-level engineering into infrastructure-side engineering that can be more-or-less accomplished without it in performant backend application infrastructure using {C, C++, Rust, Go, Haskell, Erlang} or using cloud-native control-/data-plane configurability that makes it moot. The one of the keys to large-scale ops is striking a nuanced balance of engineering flexibility across the levels of both the application stacks and the network stacks.