Why does Facebook keep pumping out 21st century moral equivalents of UML and OOP design patterns - trendy technological ideas that are often considered the gateway to writing 'professional' code, but end up being overengineered boilerplate nobody actually needs.
GraphQL makes sense in the narrow context of "you have a high latency end-user and you're pulling in deeply nested social graph data". It didn't need to be a general purpose framework, but you don't get to start your own company and talk at conventions about the clever API design you did at Facebook for Facebook-only problems. The incentives are for (a certain type of) developers to act like this solution is a panacea and sell it as a revolutionary new architecture.
GraphQL is one, Redux is another.