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You might assume this pattern is inherent to streaming. It isn't. The reader acquisition, the lock management, and the { value, done } protocol are all just design choices, not requirements. They are artifacts of how and when the Web streams spec was written. Async iteration exists precisely to handle sequences that arrive over time, but async iteration did not yet exist when the streams specification was written. The complexity here is pure API overhead, not fundamental necessity.
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The crashed airplane. Credit: Wikimedia Commons
The I/O uses IOSurfaces — the same shared memory mechanism used for GPU textures. This means zero-copy transfers between GPU and ANE are theoretically possible if you share the same IOSurfaceRef.