Also note the "blockchain trilemma": at the moment you can have decentralised and secure systems that don't scale (e.g. Bitcoin), or you can have scalable and secure systems which aren't decentralised (e.g. all the "private permissioned blockchain" solutions which don't actually need to use a blockchain).
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Or scalable and decentralized systems that aren't secure (e.g. SMTP) :)
Yes, and as per your example this combination also doesn't need blockchain. The only combination that actually needs blockchain is decentralised and secure.