Why does only bear get something cooler from mage tower

[Karat-anubarak (Karat)]

The official reason is because it’s a unique model with unique animations.

@Kaivax

During Legion, the Mage Tower awarded most specs a new weapon appearance, yet players who missed earning those still have countless other admirable weapon transmogs to collect across the whole of the game. But for Guardian druids, the Mage Tower prize was an alternate bear form with a unique silhouette and animations.