You don't need a try-with-resources, you can manually call close if you want, or has to work in a non-lexical scope.

But you often want the concurrently running threads to return some results, that try-with-resources is part of the structured concurrency that helps you with closing off a branching point, similarly to how we use while loops instead of gotos. `go` in itself corresponds to `goto` basically, with many of the same negatives.