Your assumption is that they only help accuracy. Instead they can allow you to visually hide important UX elements and yet keep them discoverable.

I'll have to think a bit longer to come up with good examples.

Edit: non-scrolling swipe gestures are where this is the most valuable.

Improved Google Photos app image selection: a hard press would start selection, and as you continously to drag to select it would provide tactile feedback for where the image borders are, making accidental selection less likely and quicker to detect. Selection would stop on release (to make scrolling easy). Hard press and swipe again to continue the selection.