I'm sure it does work well if the database is perfectly tailored to your app. I'm skeptical that it can handle every new use case that might come up -- i.e. if

I'm sure it does work well if the database is perfectly tailored to your app. I'm skeptical that it can handle every new use case that might come up -- i.e. if you need to query for something hidden in a blob. Sounds precisely like NoSQL. It works until it doesn't.