TSV. Plan9's NDB. GNU Recutils. Bencode or even djb's netstrings.

Plenty of formats that require less computing power to manage and less effort to read. Yet the hindustry settled on JSON/YAML/XML.

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Best format doesn't always win because of network effects.

I doubt any efficient data serialization and marshalling formats, as well as fast and efficient software in general, are ever going to be widely adopted unless a global energy crisis occurs and everyone is forced to live on 40W max per desktop.