Hypothesis: overall desynchronization meant tearing down a lot of walls. We still need *some* protection for our time... hence scheduling overhead.
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Related hypothesis: desynchronized only really works if we're mostly asynchronous. So we need to increase the cost of getting our time synchronously.
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Calls themselves are extremely synchronous, like a sudden global mutex lock on your whole activity. Scheduling calls is a way to reclaim normal desync existence from such catastrophic events.
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