The posture details in this level — finger position, level back, descent order, elbow placement and sitting style — belong to the Sunnah form of the prayer. They should not be upgraded into Fard conditions unless the source separately states a validity requirement.
For example, Sujud itself is a pillar, but descending knees-first is a Sunnah method.
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The Sunnahs of Prayer, Part 2: Recitation and Movements
The posture details in this level — finger position, level back, descent order, elbow placement and sitting style — belong to the Sunnah form of the prayer. They should not be upgraded into Fard conditions unless the source separately states a validity requirement.
For example, Sujud itself is a pillar, but descending knees-first is a Sunnah method.