The more a system relies on a core mechanism to force action, the less sustainable it becomes. Push systems tend to cause bottlenecks by ignoring natural capacity. Work is released downstream whether or not the worker has the capacity to process it. In a push system, capacity problems are discovered after the fact. Work begins to pile up and, as it grows, can easily escalate into an emergency. Because it relies on committing to up-front guesses and does not anticipate the extra work, the push system can only react through costly and lagging responses like overtime, emergency hires, and delay.
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