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This is what I don't understand.

For me MongoDB and PostgreSQL aren't really playing in the same field. Yes they are both databases. But I wouldn't use PostgreSQL for document storage (the recent JSON addition is pretty weak). Likewise I wouldn't use MongoDB when I need my data to be more structured. I would have no issue using both at the same time.

I guess everyone is looking for that mythical single stack of technologies they can use for every use case.

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