I am wondering why some menstrual cup companies don't sell cups in different sizes for different cervix lengths. Granted, some companies do, but it baffles me why others don't. Isn't the purpose of the different brands of cups to offer other cup dimensions (and, in the case of the LilyCup Compact and Femmycycle, features)? By pandering to the "one size fits all" mindset, a company will be missing out on potential profit if customers decide to get another company's cup because that cup actually fits their cervix. I've never understood why companies offer multiple sizes with different diameters, but not multiple sizes with different lengths. Can anyone explain this?