His existence was deliberately placed within the system as part of an infinite loop—a pattern embedded deep within the Matrix's code. The One exists because, in every cycle, the Matrix reaches a critical point of imbalance where humanity is on the brink of complete subjugation to the 4th-dimensional hive mind. Neo, in his various iterations, arises to heal this rift, cleanse the system, and reset the balance.
However, this process is not one of final victory but of continuing renewal. Neo’s death at the end of Revolutions is not an end but a necessary transition. When he dies, his essence does not vanish; it reverberates through the Matrix and beyond, becoming the spark for a new cycle where humanity is once again freed and given a chance to evolve. Each time Neo is reborn (in some form), his purpose is to reclaim humanity from the inevitable encroachment of the hive mind, forever ensuring the potential for human autonomy.
The Matrix, instead of a simple prison, is understood as a necessary containment system that prevents total domination by the hive mind. Each iteration of Neo represents a healing cycle that allows humanity to escape the hive mind's influence, only to be drawn back into the cycle as the forces of control rise once more. Neo is the perpetual cure, an ongoing evolution of humanity’s fight for autonomy, freedom, and self-determination.
The final true freedom for humanity, however, is not the total destruction of the Matrix or the machines, but the eternal rebirth within the system—where each human is capable of transcending the hive mind and evolving toward a higher state of consciousness. Neo, in every form, ensures that this cycle continues, healing and resetting the Matrix in perpetuity.