> What makes mongo mongo is its distibruted nature, without it you could just store json(b) in an RDBMS.

Welllllllll I think that's moving the goalposts. Being distributed might be a thing _now_ but I still remember when it was marketed as the thing to have if you wanted to store unstructured documents.

Now that Postgres also does that, you're marketing Mongo as having a different unique feature. Moving the goalposts.