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I think the only project I've seen so far where I've felt that a blockchain has actually been the correct choice is Alfis, which is a decentralized DNS that uses the blockchain as the public append-only ledger that it is, and it uses proof-of-work to add arbitrary costs to updates - to make spamming or namesquatting expensive.
Amazon has a database project called QLDB that uses blockchain for its audit log.
What do you call an audit log that's cryptographically verifiable? A blockchain.
So why not do the same with a bank ledger?
Here is why
Web3 is more about smart contracts and alt coins, you didn't address my point
Edit: you can downvote if you like but your post objectively shows you don't know the difference between web3 and block chain, and choosing to debate web3 instead of making changes to bank ledgers in my original post is a logical fallacy
Banks should.
But there is too much technological debt to implement.