While asynchronous programming seems to be simpler than some other concurrency models, it still is way complicated when compared to normal sequential programmin

While asynchronous programming seems to be simpler than some other concurrency models, it still is way complicated when compared to normal sequential programming; and thus should be opt-in, not inevitable by default. Some time ago I wanted to have a little firefox addon that would list bookmarks tagged unread, and IIRC I had to use promises and async calls, all in some ten lines program that essentially maps a function recursively over a tree (which I didn't have to do explicitly because that was what the promise API did for me).