The blockchain is simply a solution for decentralized consensus. Think of the blockchain as a big database that contains a ledger of who owns how many coins. The question is, who can be trusted to maintain this ledger? If a single entity owns it, then that entity can act maliciously (steal other people's money) or be coerced/shut down by governments. The blockchain is a solution to create a ledger where nobody is in charge, but rather operates by agreement. The proof-of-work that miners perform make it unfeasible for any one individual to control the entire network.
If you don't have the need for decentralized consensus, then you don't need a blockchain. It sounds like you want to be in complete control of the issuing of new currency, and therefore, a blockchain would be a wasteful solution for you. If you don't want your currency to have any central authority, then a blockchain is a well-vetted solution. It all depends on your intent.