Blockchain is a terrific idea! Make it blockchain!! Not "block chain" like the git log but "blockchain" make all software use blockchain to make the world a better place for all of us!!!
Block chain is a fairly generic, badly misused term that I assert also covers the git log, which is actually a chain of cryptographic blocks where each block includes the hash of the previous. It even has a consensus algorithm. You can disagree, but your assertion is just an opinion in constrast to a misuse of the term Merkle tree.