I also think at least for me…why have a sling on a DR comes into this question. For me it is not so much about carrying the rifle as much as it is using the sling when I am forced to fire off hand at a shorter distance defined as I just can’t set up sticks for several potential reasons and I want a more stable rest. Otherwise I am comfortable carrying my DR over my shoulder
My VC came with the front one only, not kidding. I fitted a back one because I am not good at vertical carry.