I think it could be better worded as “when you’re using tasks only for the side effects”. The ordered key will not make side effects occur in the order of the enumerable, it’ll only affect the returned stream. Side effects will always occur when the task is processed, so if you need to rely on side effect order you should use Enum.each or Enum.map. As you point out, with ordered: false, there’s no need to buffer the results. So the docs are saying basically if you’re going to pipe Task.async_stream into Enum.each, you should use ordered: false.
