Yes, Evocation is a poor school and Conjuration is stupidly versatile. It's been a well-known fact for some time now. Even so, Vaarsuvius is consistently the Order's most powerful member. So what are you arguing for, exactly? That Aarindarius should have explained to V in detail why they were making a poor choice, only for V to go through with it anyway? That would be a spectacular waste of space in the book.