Ah, that's a common misconception. Even with coroutines you still want explicit async calls and futures, otherwise if you restrict yourself only sync calls, you either have to artificially serialize operations or have to spawn artificial coroutines.
What do you do not want are explicit uses of 'future::then' and the required manual CPS transform. Instead you want a wait-for-{any,all} future operations.
What do you do not want are explicit uses of 'future::then' and the required manual CPS transform. Instead you want a wait-for-{any,all} future operations.