Comment by threeseed

It has the ability to make real-world concurrency scenarios trivial e.g.

* 3 fibers - each fetches from remote storage, local storage and in-memory cache.

* Race them, kill the two slowest and give me the result.

* Free the resources safely including if any of the connections fails for an unforeseen reason.

That's a few lines in ZIO. Pain to get working properly in Java, Rust, Go, C++ at least.