Yes, Minister.Oh I don’t know. Latin is a dead language. Nobody, but nobody speaks it. Yet those that can read/write and translate it have demonstrated an ability to comprehend an alien subject and master it.
Thus when Bernard is put on a new project, Sir Humphrey would have some confidence that he could at least grasp the core issues. As in fact the “real” Bernard and Sir Humphrey played out many times.
You can’t teach “how to be a civil servant” on a degree course, so you must look for other vehicles as an assessment. Just like if you are bombing an obscure feature in a Lancaster, which doesn’t show up on the H2S, you figure out how far it is from a known/visible feature and you’re off to the Dresden races.