Only reasoning that my old mind can come to is being the metal weather head is outdoors and too high for a person to come in contact with risk of an electrical shock is very low. Never came across a weather head that was energised. Was scary cutting out some old 30 amp services high off the ground that had cracked rubber insulation. Would cut both wires close to utility splice but some times old rusted 1/2" conduit was higher then utility point of attachment. Not a big fan of plastic weather heads. The day before I would do a 100 or 200 amp service liked to make up the weather head with 3' of wire hanging out and two layers of white tape on the grounded conductor and silicone the top hood on so it could not fall off. I would start maybe an inch below where the wires left SE jacket so cable clamp tightened down on a few layers of tape.