Yeah it's kind of like the restaurants that market themselves as being special because they use all cuts of meat - snout to tail or whatever. It's great but it's not special lol, the large food manufacturers literally use every single piece of the animal, down to selling the inner linings of the intestines to the medical industry. It's like fractions of a percentage point that is wasted.
Killing animals we don't eat just for fashion is a different story. I don't agree with that. But in the case of leather...