Didn't druid already get wildshape on a short rest? I do agree that barbarian Unarmored Defense is a bit lackluster though.

I get what they were thinking. Monk gets to add Wisdom because their awareness let's them dodge, so it should be roughly equivalent to let a barbarian add Constitution because their natural durability makes them harder to hurt. Dexterity being one of the main Ability Scores for monks throws this out the window though