With REST I can fairly easily filter out any data based on roles/permissions either at query time or before turning it into JSON. With GraphQL I need that info deep in the resolver logic and for nested data I don't want to fetch the name of a person if they calling user doesn't even have access to see that user (and I don't want to fetch the user and their name only to delete it from the response later). GraphQL, being so open-ended to what you are fetching, means I have to make sure to plug a ton of holes whereas REST I have a specific query, there is no way to fetch nested data (unless I specifically allow it via GET/POST params). I can easily say "If role X -> use this query, if role Y -> use this query, etc", I found that very difficult to do in GraphQL.
GraphQL feels like magic when you first start with it (which should be a red flag) but once you need to support more roles or sets of permissions and as your business logic starts to creep in things go haywire. In my experience things that are easy up front are unmanageable once business logic gets added in. For straight CRUD it's amazing but very rarely do our apps stay as just CRUD and that's when things fall down. For example, on create of a new user I need to send a welcome email. It's been 5 years since I was working on that GraphQL project but I have no clue how we'd handle that. I'm sure there is some kind of a event system we could hook into but with REST I just have a simple endpoint that saves the data to the DB and then sends and email (or puts it in a queue), way easier than in GraphQL. Again, fetching and updating data is easy until you need to handle edge cases. I have the same feelings about Firebase and friends. Feels like magic at the start but falls down quick and/or becomes way too complicated. GraphQL feels like DRY run amuck, "I have to keep writing CRUD, let me abstract that away", ok but now if you need special logic for certain use-cases you have a mess on your hands. Maybe GraphQL has ways to solve it but I'll bet my hat that it's overly complicated and hard to follow, like most of GraphQL once you get past the surface.
I'd love to see a "Pet Store" (I think that's the common example I've seen demo'd in REST/Swagger/GraphQL/etc) example with heavy restrictions based on different users/roles. It's like using the "Todo app" example in a framework, sure that works and is straight forward, I want to see how you handle the hard stuff and if it's still easy.