I think there is a big difference between hiking through the dark on an established trail vs doing actual land navigation in the dark.
When we do long day mountain ascents in the fall and early spring, it is not uncommon to set out in the early dark am on an established trail. However we are typically equipped with the proper lighting gear which includes headlamps and handheld flashlights when needed.

On the other hand, land navigation at night and not on any trail is not something I do as there are far too many chances of getting injured or worse.

One of our little informal training exercises with the Oregon Grotto was to climb in a select lava tube cave a couple miles, then kill the lights and try to find our way out. It is almost impossible not to lose your nerve and start flinching after bumping your head a dozen times. Such a complete absence of light does enhance your hearing, in unsettling ways until you get used to it. Climbing over the breakdown was a real pain.

It was a good exercise. But not for the faint hearted. 2 miles underground in the dark took the better part of 6 hours, and that in a cave we were already familiar with. In big chambers, it is dangerously easy to get completely turned around, and start back down the way you came.