The history of diligence in properly utilising and applying security measures strongly suggests that QC will in fact provide positive utility even if viable PQC countermeasures are developed and deployed.

From yesterday's posts: <https://news.ycombinator.com/item?id=48983610> (my comment on the Romanian land registry hacking thread).

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kibwen a day ago | parent [-]

I'm afraid I don't see how the linked comment demonstrates the positive utility of QC.

	▲	dredmorbius 16 hours ago \| parent [-]
		The link shows that well-established security practices are often not followed, even by those who really should damned well know better. Which is to say: even when PQC mitigations against QC are available, I expect a target-rich environment for QC attackers.