I don’t disagree, but on the flip side this would seem to parallel WordPress’s own behaviour where a subscriber (or even an unauthenticated user) attempts to access a draft. They will see a 404 error, typically, whereas an admin will be able to view it.
Where possible we do tend to follow the same path as WordPress but – again – I can see your point. What I’d recommend in this case is posting this as a feature request on our UserVoice page, as we’d love to see if others feel this is important or have other views on the subject.
Thanks!