The reason to build blockchain based systems is the desire for architectural decentralisation and trustless systems. Most use cases you can think of you have al

The reason to build blockchain based systems is the desire for architectural decentralisation and trustless systems. Most use cases you can think of you have already seen elsewhere, hence why you can think about them right? To give you a concrete example of a use case that can't be met without a blockchain, I'd suggest looking into Aragon and their DAO (decentralised autonomous organisation) software.