Not at all, Claire. Sparx mentioned parralax in his original post and Noblebeast suggested that the TLR might not the best tool for handheld street photography. The lens distance is only two inches and not a consideration in most shooting circumstances but Erickson mentioned the built-in parallax indicator which is great in most closer shooting situations but You are right, the paramender is the best, most accurate tool when you have the camera on a tripod, especially in close-up work.
That reminds me of another feature. The long bellows on the Cs allows major close-ups without additional accessories.