I honestly don't understand why Nidalee was nerfed...
But Jayce is left as is. Nidalee poke was way too strong, but apparently Jayce is fine the way he is. Now I could be mistaken, but I believe the hitbox on Jayce's poke is actually larger than Nidalee's, making it MUCH easier to hit. Jayce deserves the same treatment as Nidalee.