Well, they rely on doing pretty much everything in the application layer, which can become messy and cumbersome. Relational databases are the way they are for a

Well, they rely on doing pretty much everything in the application layer, which can become messy and cumbersome. Relational databases are the way they are for a reason. NoSQL is often selected, not because they address requirements better, but because developers are not even aware of the problems that relational databases solved years ago.