It can, however, become an equipment issue if you're required to use a sling which prevents quickly switching the weapon to the off-side shoulder. In fast-paced situations it might prove handy to be able to keep the weapon mounted strong-side and be able to shoot around the off-side barricade/cover available.
I use a 2 point sling on my rifles. A sling is for 2 purposes, carrying the rifle and to enable the use of a hasty sling. Some will say that a single point or other sling allows for faster transitions to a handgun. I just don't see it.