> Async enables clear contract for a type that represents a delayed result. It's not really a type, otherwise it would be something like Future<T> in Java and

> Async enables clear contract for a type that represents a delayed result. It's not really a type, otherwise it would be something like Future<T> in Java and plenty other languages. It is usually implemented as a transformation to a state machine. Also, Loom is M:N and calling them green threads doesn't give you the whole picture at all. Not exactly sure what you mean by easily interleave -- functionality wise the two is more or less equivalent. You just get to keep your simpler mental model (and tooling) with virtual threads.