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On the first loop iteration, there is no backing store for tasks, so
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Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
This is the intuition the new API tries to preserve: streams should feel like iteration, because that's what they are. The complexity of Web streams — readers, writers, controllers, locks, queuing strategies — obscures this fundamental simplicity. A better API should make the simple case simple and only add complexity where it's genuinely needed.