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Why did the First Council of Constantinople reject Apollinarianism?

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Christology The Transfiguration, the nature of Jesus as the Son of God being revealed to the apostles Peter, James, and John, mosaic icon, early 13th century; in the Louvre, Paris.

The First Council of Constantinople rejected Apollinarianism in 381 CE because it was considered insufficient to describe Christ as God incarnate.1

Apollinarianism, taught by Apollinaris the Younger, asserted that in Jesus Christ, the divine Logos took the place of the human mind or rational soul, leaving Christ with a human body but without a complete human nature.213

The Church rejected this view based on the principle that for humanity to be saved, Christ had to take on human nature completely. As Gregory of Nazianzen famously stated, "what had not been assumed would not have been healed". By denying that Christ possessed a rational human soul, Apollinarianism failed to account for the full Incarnation, which orthodox Christianity maintains is essential for the salvation of humanity.31