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Probably the same reason why Intel is reportedly moving away from SMT in its consumer chips?

Despite Mike Clark from AMD’s recent assertion, processors which get great boost out of SMT tend to have poorer single thread performance. After all, if you’re able to saturate your core with work, then you aren’t going to get much benefit from adding another thread.

There are also security implications though those tend be less severe in consumer products and are of greater concern in servers or anything targeted by more advanced malware.

Could Apple one day do so? Sure. But I’d be a little surprised if their P-cores used SMT anytime soon.