Valid for you. The point of multiple sizes is that for some use by one hand is not their top priority. That's why Apple's computers come in varied sized as do their iPads now. Having varied sized iPhones only increases sales and customer satisfaction.
As a mini user I have to disagree. While I'd love an RD, not at the cost of weight, bulk, shorter battery and/or heat. The mini is is a compromise that's all about max portability. Taking that away would not be good IMO.