I'd argue that the power of a classical relational database makes it easier to handle for someone without in-depth knowledge of databases than many NoSQL databa

I'd argue that the power of a classical relational database makes it easier to handle for someone without in-depth knowledge of databases than many NoSQL databases. Of course, if all you need is to look up values by keys, a key-value store is a much simpler solution. But the moment you need more complicated or just different kinds of queries than you expected, NoSQL can be rather difficult. You can get a lot of complicated queries done with mediocre SQL knowledge and a general-purpose RDBMS, but trying to use a more specialized database outside the intended use can be pretty painful. I don't have all that much experience with NoSQL databases, but my impression was always that it is more important there to understand the limitations of the database than with something like Postgres that is more forgiving. They might be simpler to get started with, but much harder to use correctly.