Why the East Never Defined Purgatory
In the medieval West, theology increasingly described salvation in legal categories: guilt, satisfaction, punishment, merit.
Think of the influence of Anselm of Canterbury and the scholastic tradition. Within that framework, Purgatory became dogmatically defined, a necessary post-mortem satisfaction of remaining penalties.
But the Orthodox East began somewhere else.
The Fathers, like Gregory of Nyssa and Isaac the Syrian, speak of salvation not as legal balancing, but as healing. Illumination.