[Felk]

For me one of the biggest advantages of using GraphQL is that clients consuming data can directly express what they want. The backend implementation can then do all sorts of magic to turn intent into execution.

Regarding the n+1 problem: of course that can be solved with plain rest endpoints as well, but it requires you to form your API around it, where if you have one unified endpoint solving the n+1 problem is a mere implementation detail on the backend.

In situations where it's desirable that a system's complexity is expressed in the API design, I can see GraphQL not being a good fit. If I compare it to SQL it is understandable that you sometimes do need to restrict what can be done to clear predefined operations, say for performance reasons. But if you can get away with this general "intent-based" querying, which GraphQL does well, I recommend it over plain rest endpoints.