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<@U0ZFBBUBU> I can recommend this piece on why async has to be always async. It is about callbacks, but it applies to any style of async programming: <https://blog.ometer.com/2011/07/24/callbacks-synchronous-and-asynchronous/>
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You can always fine-tune your performance later. You have at least two tuning means -- using `Unconfined` dispatcher for very light-weight coroutines (they will always execute in somebody else's thread without any thread switch/dispatch) and using `CoroutineStart.UNDISPATCHED` to run initial portion of the freshly started coroutine directly in the invoker thread.