What do you mean? You can literally run GraphQL without HTTP. This isn’t just a GraphQL-ism, gRPC also does it https://grpc.io/docs/guides/status-codes/

I understand that most people use GraphQL over HTTP and that from a developer perspective you’d rather have HTTP status codes like every other REST API. To which I’d say, why don’t you just use REST instead?

There are a bunch of legitimate reasons why a clean separation of transport layer and application layer makes sense - you just aren’t using them so it feels like an arbitrary frustration to you.

Have you ever run an application like a golang REST API behind an envoy or nginx proxy or load balancer and gotten an HTTP status 500 back and wrongly assumed it was coming from your application/golang code, only to later find it was a problem at the proxy or load balancer? If so, you’ve experienced the misdirection of combining transport and application layer being forced to share a status field. This isn’t a trivial example - time is wasted every day by developers misdiagnosing errors originating from transport as application errors, and vice versa.

You might not like it, but separating them IS smart design.

That’s true, but for a good reason. GraphQL is transport agnostic, so using HTTP status to represent errors doesn’t make sense. HTTP is just a carrier for GraphQL, and the status code represents whether or not the HTTP part was successful.