I'm honestly not seeing much here that isn't identical to almost all other general purpose RPC systems: https://graphql.org/learn/authorization/

"check that the user matches the data they're requesting by comparing the context and request field by hand" is ultra common - there are some real benefits to having authorization baked into the language, but it seems very rare in practice (which is part of why it's often flawed, but following the overwhelming standard is hardly graphql's mistake imo). I'd personally think capabilities are a better model for this, but that seems likely pretty easy to chain along via headers?