I agree about the type system, but as far as async is concerned, javascript with its (now standardized) promises is miles ahead. The main advantage IMO is not t

I agree about the type system, but as far as async is concerned, javascript with its (now standardized) promises is miles ahead. The main advantage IMO is not to gain performance, but to allow concurrency without data races (as required by a GUI that needs to wait for a server). If you try async programming in C++ or Python you'll quickly discover that half of the libraries are pre-async and block, and you'll have to resort to threads and still worry about data races.