The OP is neglecting to address the fact that a blockchain is a distributed ledger and Bitcoin is simply a currency that has all tx's stored on a blockchain. These days there are MANY applications using blockchain tech and most have nothing to do with Bitcoin.

As the OP mentions, those blockchains are mostly for records keeping. From food production and distribution, civic lighting (streetlights etc), to civil records such as deeds and other property records, taxes, etc you will find blockchain tech used where such data was once stored in a database. Why the change from using a traditional DB? Simple: Security. A normal centralized DB can be broken into and easily modified. A distributed blockchain database cannot be hacked so easily.