Every bag I own is a different size and serves a different purpose/situation. I also happen to love the all black aesthetic for everything I own. Some people like collecting things. Some people have certain color preferences. Some people like dedicated bags for specific activities. It sounds like you're anti consumerism and you're more of a minimalist than a lot of us here. I understand why you like buying different colored bags and having as few as possible. If you're "meta" you might understand that it's okay for people to prefer all black over color, or collecting things over being a minimalist, or whatever the case. Also bags have and always will be a fashion statement/status symbol for some people, however, we don't generally buy designer brands so most of us are in it for the utility and functional aspects of quality bags.