I think the biggest plus here is ability to enforce schema validation when you want, unlike RDBMS, which does it from the very beginning. I can relate it to th

I think the biggest plus here is ability to enforce schema validation when you want, unlike RDBMS, which does it from the very beginning. I can relate it to the static typed vs dynamic typed languages. Unlike static type checking languages, dynamic typed languages gives you huge productivity at start, but eventually that flexibility starts to become maintenance nuisance. Best of the both world is gradually typed systems, like hack or flow from Facebook, where you can start placing type checking later as necessary. So you can be very productive at start, and later be safe at scale.