There's no knowledge job that doesn't rely on reference material. If a field is a knowledge field, the material cannot be anything but too big and detailed to r

There's no knowledge job that doesn't rely on reference material. If a field is a knowledge field, the material cannot be anything but too big and detailed to remember the entirety of. What you're hiring when you hire a doctor, lawyer, accountant, or software engineer is judgement. Either X is simple and don't worry about it, or this will have a simple solution and here it is, or this will take more investigation and let me look stuff up, or this is a specialist problem and I know who you need. Of course it's often the case that the professional will just give you an answer, because there's certain bread and butter things that everyone asks about. But that shouldn't trick you into thinking they've memorized their whole field, you just haven't asked an interesting question.