Of course I am in agreement with you about normalizung function. If you find verts that are fixed that is because they lack the IAR and are therefore not positionally correct. I don't have sufficient knowledge to say a total yey or nay. That is, if a vertebral motion unit is fixed in the neutral position, abnormal dynamics will express at the next freely moveable units in the kinematic chain. This is true in the vertebral column or even the axial kinematic chain extending from the occiput to the foot.
Same thing can occur in the upper extremities.