The documentation frames "asynchronous continuation" only within the context of automatic activities. Async is useful when a process shouldn't block the thread and/or transaction while an activity is being carried out.
This is great, but how about long-running human tasks? They are not automatic activities, and there surely is a benefit in handling them asynchronously. I couldn't tell from the documentation whether tasks are considered async by default. Are they? If not, is there a way of making them async?
They are considered 'async' by default.