The real cost of GraphQL is resource usage/performance on the backend. On the development side, the cost is that GraphQL allows developers to get away with wri

The real cost of GraphQL is resource usage/performance on the backend. On the development side, the cost is that GraphQL allows developers to get away with writing really messy code whereas REST basically forces them to follow a more structured approach with better separation of concerns between components (to mirror the separation of concerns which REST endpoints naturally have). But I don't think this concern is that important because developers CAN design good software with either approach if they have the right mindset.