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What is really difficult is whether the entire asynchronous link can remain clear for a long time.

The real pitfall is usually not in the syntax, but in whether the "page life cycle" and "task life cycle" are aligned.

The real trouble is that these problems often manifest themselves as sporadic outages in the business rather than explicit breakdowns.

Actors are not "Swift locks". What they really change is how shared state is organized.

Task is not the universal entrance to asynchronous code. What really matters is who creates it, who cancels it, and who is responsible for the results.

They often appear together, but they answer three questions respectively: "Where does the task come from, who is bound to it, and who changes the UI?"

It is to make the asynchronous system regain the conditions for long-term maintenance

It is Swift's attempt to upgrade concurrency from "depending on convention" to "language capability"