But GraphQL doesn't allow for infinitely nested queries; the query itself has to include as much depth as it wants in the response.
> Then we just come back full round trip to REST
Except that GraphQL allows the back end to define the full set of fields that are available, and the front end can ask for some subset of that. This allows for less load; both on the network and on what the back end needs to fetch data for.
From a technical perspective, GraphQL is (effectively) just a REST API that allows the front end to specify which data it wants back.