I'll weigh in here with my two cents: I can't say that I do much night-running but I have done some night-time hikes with my ZL 600c MK IV and older 600w MK II and I have no issues with the weight of either light. It may be more a personal preference: I know some people find 1xAA light just perfect and 18650 lights just too heavy. YMMV.
You can get their 18650 headlamps in a non-frosted lens version, too. Much less floody. Generally, less useful as a headlamp, IMO, but if you're around other people, it's probably better for them.
Interesting perspective. I find frosted headlamps better for short distance, i.e. campsite, duties or working on car, looking for things in the garage, basement, attic, closet.
For walking / hiking at night, I find frosted lens on a headlamp shows a wall of light with very little separation which reduces depth perception. Especially true when mountain biking or when there is some mist / fog. I went for a night hike in Yosemite about 2 years ago, I had my older 600w MKII and I found the 12 degree spot / 80 spill reached out more and the spot provided more detail and depth.
I recently did a night hike along an old rail trail with my newer 600c MKIV Plus and the 17 degree hotspot / 80 spill wasn't good enough, even with the 4000K tint, to give me a lot of depth. Even about 20-25 feet out, there wasn't enough separation. The light was still too diffused to give good depth perception for my eyes. Of course, one can argue that, when hiking, you should only care about the next 5-10 feet in front of you but when you're looking up at the trail, it was difficult to see much detail. YMMV, it may be my older eyes and also personal preference.