Lambda the Ultimate

I have noticed that in the last decade or so various programming languages have adopted an async/await model of concurrency (Javascript, C#, Rust, Zig, etc.). This surprised me as my experience with Lua had me assume that a coroutine model of concurrency was superior and would win. Obviously I have missed something. What are the advantages of async/await? More explicit? Lower level? Easier to implement? More flexible? How else do async/await and coroutines compare?