GraphQL is a really important use case for Prisma. That is using Prisma as the "data layer" on top of your database when implementing a GraphQL server (e.g. using Apollo Server). However, it's not the only use case since you can effectively use it with any application that needs to access a database (e.g. REST or gRPC APIs). We actually wrote a blog post exactly on this topic: https://www.prisma.io/blog/prisma-and-graphql-mfl5y2r7t49c/
This would make sure you deliver the value people need, and also that it won't remain a subjective book with only your opinion