 When the low-traffic assumption does not hold, system consists of multiple inter-dependent Fork-Join queues, which makes exact analysis intractable due to state space explosion.
<clarity>  When the low-traffic assumption does not hold, system consists of multiple inter-dependent Fork-Join queues, which makes exact analysis intractable due to state space explosion.
 In the high-traffic regime, the system consists of multiple inter-dependent Fork-Join queues, which makes exact analysis intractable due to state space explosion.