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One of the few redeeming qualifies is reusing blocks of configuration but it's so extremely limited and they decided YAML was focused on being a data serialization format with configuration as a low priority so they stopped improving that and it's essentially deprecated.
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JSON using quotes for string keys is a good thing because it means you can add non-string keys unambiguously unlike JavaScript where it has to be a whole separate Map type to fix what was wrong with trying to use Object as a dictionary type.