there is a another "s" word for that, it is called specialization - each product or service specifically invented and developed for a particular body part ( never mind that the active ingredient and formula is exactly the same except maybe for the perfume and the packaging design. oh well).
doing as many and as little segmentation can be good business. it increases desire, there is specializati0n, encourages multiple purchases and builds loyalty. the cosmetic and beauty industry has exhausted all the body parts that we normally see and now they're going after all the body parts that are normally hidden from us.
segmentation and specialization - two, not just one lesson brought to you by the armpit. (please check the color of yours after reading this.)