"Also, multi-threaded async runtimes are generally what you want to make sure you don’t have any single tasks blocking others that could make progress in parall

"Also, multi-threaded async runtimes are generally what you want to make sure you don’t have any single tasks blocking others that could make progress in parallel." Is there an advantage to multi-threaded async if you're IO-bound? If you want a bunch of concurrent system calls or network requests it seems like single-threaded async can handle that pretty nicely ala Node.js.