I don't know why, probably because it's harder to create armor for Skyrim since the graphics are better than in Morrowind.
Thats not entirely true. Meshes from previous games could be tessellated and reskinned...similar to a project that I will not mention because its not allowed to be talked about.

I was very close to investing a lot of time bringing a lot of Morrowind items in to Skyrim from scratch. (check out the texture mods i have) however..i ran into some technical issues with my copy of 3ds max (as many here know) so I wont be releasing any of the stuff i worked on.
One thing I still plan to do, as its just a simple texture is to reskin an orc stronghold so it looks like a Velothi style building.