@autism101 I always use subs when available (and they should always be available, annoys me when they're not).
My hearing isn't fantastic, and the modern tendency for pushing the dialogue deep in the mix really doesn't help matters.
But I also just struggle badly with so many voices and accents, and I tend to focus too much on background sounds (including those in my world, not just coming out of the speakers), so subs are always useful.