When Sephiroth delicately picks his way after Noctis, it's still with careful mindfulness of where the fae forest is in relation to the hypothetical Prince and or King. He said he'd keep the faeries from being a problem, and he would.

It sounded like that went beyond simple educational subjects like math or reading. Those didn't really leave a lasting impact, did they? "Not regular education things."

What were the important things? What had he missed out on?