Blockchain is a cryptocurrency specific technology, one might have thoughts about using better data structures for this purpose but the opposite side is absurd: There is no other serious application for blockchain.
There are multiple real word applications for a blockchain besides cryptocurrencies. Crypto's are just one of a lot applications.
It can be used wherever a trustless decentralized storage is desired.
Some applications would be:
- Supply chain
- Digital Identity
- Data management between organizations
- Patient chart
- IoT
- Real Estate
There is no "technology" named blockchain. it is just an inefficient messy data structure used in bitcoin, nothing more.
Define efficiency.
Do you have a better approach for a trustless decentralized data storage ?