I believe that this is also why we're starting to see a surge in people wanting to run SQLite as their backend database. It's similarly simple to start out with, and also similarly flimsy when dealing with actual data integrity. Very limited types, limited isolation options, ref integrity disabled by default (Mongo DB also disables things by default that hurts their benchmarks).
But hey, SQLite is better than Mongo DB, at least. So we're making progress