They're juniors who also think SQL is obsolete because you can't POST a json into it. They'll understand that in order to solve problems efficiently you need a toolbox of a reasonable size.
Yep I’ve had this recently too. Three devs joined the team who had no experience in relational databases, didn’t even know what SQL was for.
A few weeks later they told this story of using MongoDB and how they had layered some rules on top to ensure data consistency...