tl;dr:"The proposal introduces a new operator. This operator is an idea borrowed from functional programming that makes applying functions more convenient in many cases. This post describes how the pipe operator works and what its use cases are (there are more than you might expect!)."
tl;dr:Benefits of using other languages: (1) Can be compiled to native binaries which have faster startup times. (2) Native binaries also usually run considerably faster than JS code. (3) Many languages make it much easier to parallelize code.