[nuclear_eclipse]

>For user interfaces this is huge advantage: you can run all your code on the UI thread; but the UI stays responsive while awaiting tasks.

... assuming any other tasks/coroutines running on the UI thread are being cooperative and not doing bad things like waiting on synchronous functions or otherwise hogging the UI thread too much. Done right, it's a big performance and maintainability win over multithreading, but when done poorly, it can result in large variance in latency/responsiveness of any individual task.