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Hilariously the metadata is in JSON, but the actual contents for the QML couldn't use it and "had to" invent a new markup for the purpose.

QML is not just a markup language, it supports js, data bindings and various other structures.

It's like saying why people had to invent JSX in their react app when they could use JSON.

There’s nothing hilarious about the fact that QML and JSON solve different problems.