I put a textured case on mainly because I like the textured feel, the extra grip, and even a touch more thickness.
Plus the case I am using has a built in stand, which is VERY hand..
I actually use something similar sometimes that is really thin and snaps on/off.. I can never go full armor. Definitely can't use a screen protector because I don't like the feeling while swiping.. I have bought them before for my Blackberry's but every touch screen I've had since had Gorilla glass, so didn't need.