> this is still explicit/userland asynchronous programming: If anything down the callstack is synchronous, it blocks everything. This requires every components

> this is still explicit/userland asynchronous programming: If anything down the callstack is synchronous, it blocks everything. This requires every components of a program, including every dependency, to be specifically designed for this kind of concurency. Welcome to the 1980s world of cooperative multitasking, but now with "multi-colored functions."