OP,
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 is no "technology" named blockchain. it is just an inefficient messy data structure used in bitcoin, nothing more.
Plus point out how costly it is for the "blockchain" in each node in the system to come to consensus that its data is what was agreed upon by the whole network as "the truth", DECENTRALLY.