Its a bit O/T but the rangefinder is a simpler readout display mechanism and it would be a stretch to consider the stalk unit to be the actual targeteing mechanism in the helmet (ref from various SW games where the targeting was done by the helmet itself). It could however be reasonable to assume that the RF gives a better display about the target according to the computer. Also in the nitpick it can be said that if it is just a Rangefinder than it would do no better than a digital scope readout which either Jango nor Boba would need at certain ranges. Also concentraing on a pop-down display readout while engaging in close combat is not the most effective use of ones eyes during a battle.