Not strictly correct here! If the roads leading off the points are dead-end sidings, with no track feeds of their own, then you do not need the insulated rail joiners as this will make the tracks self-isolating. This may well be desirable in DC. As my previous post said, you may want to power these sidings on a DCC layout so that loco lights and sounds always operate regardless of the settings of the points. In this situation you need the IRJs.