"I already had expertise in most of the relevant subjects, which isn't everything but is maybe more important than you might think, especially insofar as it's indicative of disposition. I said before that I wasn't a historian, and that's mostly because I don't particularly care about history for its own sake? So I'd be much worse at whatever the history-based version of this is, since I wouldn't be so terribly invested in it. And obviously I could copy caring about history, but I wouldn't care about caring about history, which will do in a pinch but if you have somebody on hand who's already enthused you should probably pick them. And things can get lost when copying something as broad and scattered as true expertise, mostly doesn't come up under ordinary circumstances but might make a difference in something as important as this."