Yes. And there are hundreds of weapons and armor.
Here is the issue with just the Guardian Druid form. It is a completely unique model. All the other bear ones, are still bears. Now other MT appearances are unique and desirable as well. The flails for Pally and Warrior. But there are hundreds of weapon appearances. There are a handful of druid forms. A lot of them are largely similar. Except the Werebear.
I will say that if the Demo Lock MT appearance gave a Unique appearance to the Felguard, and say changed it into a Pit Lord. You would see the same complaint.
I am all in favor of your suggestion on new challenges. I think the MT appearances need to be brought back. With some new high rez additions. But have a new challenge on par with what the mage tower was.
And I will say. I am starting to play and enjoy guardian druid. I would very much like a chance at the MT Guardian Werebear model… And I wouldnt mind a crack at the UH DK model as well.