FWIW, I had the exact same experience as the OP; I was slowly getting comfortable with Rust until I wanted (high performance) cooperative multitasking, which in

FWIW, I had the exact same experience as the OP; I was slowly getting comfortable with Rust until I wanted (high performance) cooperative multitasking, which in Rust meant getting into Async and all the complexities of Rust multiplied to a point where I'm reconsidering some life choices. And I have yet to match the performance of the C++ equivalent solution :( I suspect I would have liked the original green threads more, despite the drawbacks.