I've had an Apple Watch since the original and have never damaged my watch beyond normal wear and tear microscratches on the metal (not on the face). And I don't use a case. That said, if I were in a pretty physically demanding field, a case might make more sense (my general contractor friend who is frequently on construction sites wears one). I do work out with mine (I currently have the SS) and again, other than microscratches (which I could buff out if I cared) it looks totally fine.
I've had an Apple Watch since the original and have never damaged my watch beyond normal wear and tear microscratches on the metal (not on the face). And I don't use a case. That said, if I were in a pretty physically demanding field, a case might make more sense (my general contractor friend who is frequently on construction sites wears one). I do work out with mine (I currently have the SS) and again, other than microscratches (which I could buff out if I cared) it looks totally fine.