Rust doesn't want to impose its own one-size-fits-all runtime on all users of the language, because Rust wants to work in places where Go isn't a good fit, e.g. microcontrollers, kernels, or seamlessly on top of other languages' runtimes.
Architecture of an efficient async runtime is going to be different for 128-core server vs single-threaded chip with barely any RAM. In Rust you can write your own runtime to your needs, rather than fight overhead of a big runtime on a small device, or struggle to scale a dumb runtime to complex workloads.
Architecture of an efficient async runtime is going to be different for 128-core server vs single-threaded chip with barely any RAM. In Rust you can write your own runtime to your needs, rather than fight overhead of a big runtime on a small device, or struggle to scale a dumb runtime to complex workloads.