Originally Posted by
GenBroadaxe
I think the post ARR stories have also been setting us up to make us think of primals in less black and white terms. As Iscah mentioned, Hydaeyln is in a unique position where she's not being summoned, she communicates to us in another plane, and is able to act on our plane at will (to her detriment since it weakens her). It could be that she's a capital P primal who is a being that has always been there in some way while others are lower P primals who are created by the will of mortals and therefore act by different rules.
From everything I've seen Hydaelyn has been truthful in the brief moments she can communicate with us. She wants the balance to stay in Light's favor because it means life continues. The Ascians can never be fully honest with us because balance favoring darkness means rejoinings and the destruction of mortal life.