Here's why I want a sling on an HD gun-
I may need to unlock a door, move something quietly, use a phone, enter a code, manipulate objects in the environment, hold onto a kid, drag an injured/wounded/incapacitated family member, or otherwise use one or both hands. If any of those conditions arise, I would prefer to sling the shotgun and keep it on my person, or use the sling to help support the shotgun as opposed to putting the shotgun down somewhere, probably in the dark, and in a dynamic situation.
Shotguns are to slings as pistols are to holsters.
Not everybody wants a sling on an HD shotgun, and that's fine. But there is absolutely no need to be dismissive of one either. Just because one person may not see a use for a sling does not meant that there is not a use for the sling. There is
a way, but there may not be
the way.
I understand the concern about snagging. Here is how I keep a conventional 2 point:
That's pretty much how I run my pump guns. You can keep a sling on there and minimize the snag danger while being able to maintain control of the shotgun and not have to worry about setting the shotgun down.
The adjustable two points and even some of the three points can be cinched up more. A single point obviously is even lower profile.
Slings have limitations, the same as they have capabilities. As long as you are aware of them, train with them, and operate with both in mind you be fine. Just attaching a sling because it looks nice or assuming that it will automatically increase your skills and capabilities is naive and potentially dangerous.