How does the blockchain technology apply to the real world service? If I would like to have a blockchain technology on a supply chain service, which means under this technology, each block contains all the logistics information like storing a transaction from Singapore to Hong Kong right? So then it is just act like a database but just public can view it? then why should I necessary to develop such a service on blockchain but not continue using centralized database technology, only allow permission for beneficial stakeholders?

Please correct me as I am having a very messy concept on this topic right now.... Thank you~!