Hiya ponies! Have you ever considered establishing democracy in Equestria? Something is bound to happen, given the law of large numbers. Given that the Princesses (Twi included) is able to live for a very long time, and your time line will also be long, there is a very high chance that eventually, some or all of the princesses will corrupt, or even die from one thing or another. Shouldn't ponies prepare their descendants for their inevitable fate?