This read-create QueueType field configures hardware queue 4 as either an EF strict-priority queue or a WRR weighted queue. The setting matters because it decides whether traffic funneled into queue 4 is always serviced first or must share link capacity proportionally with other queues. For example, an admin consolidating a guest-Wi-Fi traffic class into queue 4 would typically keep it as WRR so it can't starve business-critical queues.