I wouldn't assume that nation-state attackers would be thwarted by the Secure Enclave. Organizations which can deploy taps on undersea fiber optic cables from nuclear submarines, attack centrifuges deep inside air-gapped underground nuclear facilities, etc would likely be able to mount the kinds of specialized attacks needed to break into HW trusted computing models.
Something that is tamper-resistant isn't tamper-proof.
It will likely take some time to develop a capacity to attack these chips, but it is not impossible in principle nor intractable.
Something that is tamper-resistant isn't tamper-proof.
It will likely take some time to develop a capacity to attack these chips, but it is not impossible in principle nor intractable.