Harry as Phoenix Animagus is rather common, to be honest, but Refiner's Fire/Time of Destiny gets to grandfather out of any peeves related to it for several reasons:
1) Refiner's Fire is one of, if not the, first super!Harry stories
2) coincidentally also one of the first Phoenix Animagus stories.
The reason people use it is because of the canon statement (I believe in Fantastic Beasts) that phoenixes are the ultimate 'light' creature. As such, there's the belief that this immediately makes Harry unimpeachable.--
Christopher Angel, aka JPublic
The Works of Christopher Angel
1) Refiner's Fire is one of, if not the, first super!Harry stories
2) coincidentally also one of the first Phoenix Animagus stories.
The reason people use it is because of the canon statement (I believe in Fantastic Beasts) that phoenixes are the ultimate 'light' creature. As such, there's the belief that this immediately makes Harry unimpeachable.--
Christopher Angel, aka JPublic
The Works of Christopher Angel