The use of discretionary power sounds as if you are giving enormous power to the official. In fact some of the things on which they have to exercise a decision is indeed covered by the word discretionary but is really quite technical and detailed.
Skøn lyder, som om man giver en enorm magt til tjenestemændene, men i virkeligheden er det sådan, at nogle af de ting, som de skal træffe beslutning om, ganske vist er dækket af ordet skøn, men det er faktisk ret tekniske detailspørgsmål.