However, threads are very rarely needed. The common use case in other languages is I/O, and JS environments handle that with async I/O—a superior choice, IMO.
Deno supports vastly superior threading model (such as green threads). Again depending on what you are coding, threading may not be the best model. Look at Ngnix vs Apache (event driven vs threading).
> Deno supports vastly superior threading model (such as green threads)
Whatever it supports, Javascript-the-language has no concept of threads. And workers are basically external processes with a somewhat awkward event-based communication and certain limitations.
Whatever Deno uses internally to implement them has no bearing.
And the language and the VM has been, and will be for any foreseeable future, single-threaded.