I do agree with your point, however, I think Swift is in a unique situation since they intentionally deferred on making concurrency first-class. Now the languag

I do agree with your point, however, I think Swift is in a unique situation since they intentionally deferred on making concurrency first-class. Now the language is in a much better position to implement a modern system. What about the proposal is horrendously complex? The target audience is meant to be language designers, not the average developer. The actual suggested API changes looked to be a few added keywords and some new classes/protocols to use.