And a comparison to CockroachDB which also has excellent JSON support along with all the benefits of SQL.
See: https://www.cockroachlabs.com/blog/json-coming-to-cockroach/
1. We don't need you to specify the types of any fields, indeed, we don't even need to know upfront which top-level fields ("columns") may exist in the document.
2. You don't need to use special operators / functions to deal with JSON-typed values.