I think it wouldn't be so painful even as it's pervasive if the ergonomics were far better. Unfortunately, things are still far off on that front. Static dispatch for async functions recently landed in stable, though without a good way to bound the return type. Things like a better pinning API, async drop, interoperability and standardization, dynamic dispatch for async functions, and structured concurrency are open problems, some moving along right now. It'll be a process spanning years.