It is a reflection of the way that SQL is so ensconced in the developer's gestalt as "The Way To Query Data", such that Querying Data means SQL and SQL means Querying Data, that most people are not capable of coming at something like a logic-based database layer as a first-order element on its own, but can only conceive of it as an SQL layer.

Further observe how there's a category of databases called "NoSQL"... when you have a category of something defined by its not being in some other category, that really shows just how large that category looms in the developer's mindset. NoSQL is slowly cracking the SQL consensus, but it's a long and slow process. You'll know it has really made it when we give a positive name to that category, or perhaps more likely, 3 or 4 names to the several types of databases within. "Document store" is getting close to being the name of one of the styles.

My particular reason for speaking this way though is that this specific technology manifests that way. You'll note I called for this to be made a native query layer, because I'm personally pretty much over SQL and ready for the next thing to come out. I'm tired of it being the 1970s again every time I speak to a database. Unfortunately, it's such a task that it has killed everyone who has tried it so far. AIUI FoundationDB got the closest from anyone I've seen. I'm not sure how they're doing; a cursory web search suggests perhaps they aren't as dead as I thought.