IBM MQ is the granddaddy of queuing systems and predates most other queuing systems by decades (IIRC it is (ultimately) based on the iSeries/OS400 queuing system). Consequently, it carries a lot of baggage from that time which large ops teams like for tuning to their needs, but which modern systems have largely ignored or modern environments have made redundant.
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IBM MQ is the granddaddy of queuing systems and predates most other queuing systems by decades (IIRC it is (ultimately) based on the iSeries/OS400 queuing system). Consequently, it carries a lot of baggage from that time which large ops teams like for tuning to their needs, but which modern systems have largely ignored or modern environments have made redundant.