Also Ive seen nothing to indicate that Fix OR Lily got much in the way of open access to Summer's information, any more than Harry has. He's still just a paper cup to the court, and he has officially outlived the Lady that he was hired by. I strongly suspect they were both being neglected by the wider court in step with Titania, so I doubt they've been schooled to heavily in the subtle shadings of the courts (Unless Eldest Gruff made the effort).
Beyond that, we dont know how long it has been since they've had a Knight that was actually Good at much besides Killing. And more than 100 years ago, there's not really much else you'd expect from somebody with the title of Knight. The ones we know of have mostly been of the murderous sort, but then for all we know Maeve has been in charge of the hiring for all that time.