I was thinking maybe it just wasn't meant to be slung while carried in front, but you're right - It would be really nice if it had side swivels.
Considering how well they work, why do you think they aren't just standard on everything?
Tradition, and because there's lots of people who only use the sling over their shoulder while walking out to their blind. I can't think of a single organization that keeps rifles slung and ready to shoot that still uses bottom sling mounts. Your rifle is always trying to flip around on you, which is tolerable if you don't have a magazine that extends out past the trigger guard.




















































