"Working as a distribute ledger" is a means to an end, not an end in itself. It's a tool. What is that tool useful for that isn't better served by other tools?

"Working as a distribute ledger" is a means to an end, not an end in itself. It's a tool. What is that tool useful for that isn't better served by other tools? That is the question that has never been answered, at least not to my satisfaction.