blockchain is more than a distributed database. in a distributed database someone is still in charge and can make decisions unilaterally about how the data is altered.
in blockchain you have a bunch of entities that can transact with each other with zero trust and without the need of a central authority. that is the truly innovative aspect of the blockchain and what sets it apart.
the way this is done is not unlike any system that uses event sourcing (including the distributed databases that you worship).
here is a killer use case for blockchain: supply chain management with a lot of entities and lack of trust. smart contracts are a thing.
also, there are blockchain implementation that are really performant (don’t get stuck on bitcoin)
This tells me you know zero about supply chain management.
https://www2.deloitte.com/us/en/pages/operations/articles/bl...
https://hbr.org/2020/05/building-a-transparent-supply-chain
https://knowledge.wharton.upenn.edu/article/blockchain-suppl...