Apostolicae curae was, for anyone who hasn't heard of it, a Papal Bull whereby Pope Leo XIII declared all Anglican ordinations "absolutely null and utterly void". My question is, why was it necessary at all? Was it not already obvious that Anglican ordinations were already invalid by the simple fact that they were Anglican? Does this imply that the ordinations of schismatics by other schismatics could be valid if it maintained the same rite and intentions(since those were the reasons given by Pope Leo for the invalidity of the Anglican ordinations)? If not, then what was the point in the Bull at all?

The reason for the bull was the Oxford Movement. There was a movement of Anglicans toward the Catholic church. 
As the Oxford Movement progressed, several members of the clergy and laity of the Church of England argued that the Roman Catholic Church practice of unconditionally ordaining clerical converts from Anglicanism arose out of a lack of inquiry into the validity of Anglican orders and from mistaken assumptions which, in the light of certain historical investigations, could no longer be asserted.^[2]
Those who were interested in a corporate reunion of Rome and Canterbury thought that, as a condition to such reunion, Anglican orders might be accepted as valid by the Roman Catholic Church. A few Roman Catholic writers thought that there was at least room for doubt and joined with them in seeking a fresh inquiry into the question and an authoritative judgment from Pope Leo XIII who permitted the question to be re-examined.

https://en.wikipedia.org/wiki/Apostolicae_curae