Absolutely agree. I think there's a lot of avenues to explore for better diff representations for structured data (which would also be great for ASTs, something we've been thinking about).

This format is meant to be an extension of Unified Diffs (much like the diff formats of most SCMs), and not something entirely new and focusing on other areas. But if more specific diff formats become widespread, we could directly support encoding them within DiffX as well, as we do for binary diffs formats.