There are other skills that I would consider more important to bring back - Unarmed, Athletics, Acrobatics, but I still think Medium Armor would be cool. Bonemould was one of my favorite armor types in Morrowind.
I want Bonemould too, but it would be reclassified as heavy armor. Just because you want the medium armor sets back doesnt mean you should want the skill back. The medium armors would just all be reclassified.
And why athletics? that was the dumbest skill in the previous games. You don't even do anything to level it up. DUMB.
Acrobatics isn't in anymore because they wanted a game with realistic physics. Good riddance.
I agree with h2h though. While to me it was a worthless skill, I know it adds to RP purposes and to the depth of the game.