There's efforts to overhaul it, basically there's a lot of stuff that has to be more complicated (as you'd expect) if you want to add support for async somewhere, and understanding the error messages can be pretty mentally taxing when you get it wrong; and then there's a lot of cases where the async version of some pattern just doesn't work right now due to limitations in the compiler or the language itself, and hopefully it'll work someday, but in the meantime you need to use workarounds.