I've directly addressed your points, and I get the impression that you're the one who's ignoring my points here. The reality is that blocking operations in js are handled using async calls, and reasoning about async code is inherently more difficult than sync code. Platforms that provide proper threading allow developers to write sync style code and handle blocking by using threads that are managed by the runtime. While you have workers in Js, it's pretty clear that they're not meant to be used in the same way, nor do people use them this way in practice.