1. The problem is with using HTTP for APIs, not with GraphQL. HTTP was designed for rich (hypertext) documents, not for APIs. So layering GraphQL or any other APIs over HTTP is a hack.

2. GraphQL is useful for small remote teams b/c of mandatory staticly-typed schema and built-in schema documentation. Otherwise it's lots of back-and-forth between backen, frontend, QA, etc. You forced to use external tools like Postman collections, and still having communication problems.