The Problem of Unicorn Epicycles

[batzulger]

A good fanfic diverges or expands on the canon in an interesting way that stays true to its (the fanfic's) inherent conceit of the exact expansion/divergence. Changing the ground rules of the story is about as divergent as you can get and as long as the story is interesting, it should not be an issue. Like taking the Harry Potter series and transforming it from a magical school to a school for techno-thriller spies and assassins changes the entire base concept of the world (magic is real) and changes it to James Bond was real.;