The R didn't have it and had Bluetooth connectivity to be able to have remote shutter on everything from your phone to iPad to pc. :/
That's all fine and good until want to use an RF trigger from 300 feet away and need somewhere to plug in the cable from the receiver. Or when you want to shoot under a dark sky at night without blowing your night vision by lighting up a screen on your iPad or phone. Or when you'd rather just use the simplest solution (a wired release) while keeping your phone available to do phone things (like take calls).
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