The design benefit of these emitters is that the brightness comes from a much smaller area. This means that the optics can focus the light into a smaller spot. There doesn't, at the moment, seem to be an efficiency benefit over the best LEDs, except perhaps in low power modes. This is partly because current designs are optimised for maximum brightness.
For hiking, if the light is to see where you're going, they seem pointless - the tighter focus isn't what you need to place you feet or spot trail markers. But they do project a tighter beam at long distances, so if that's what you need, whatever the activity, there's some benefit. I won't go into detail on use with weapons - again, that depends what you're doing. In this context it might be sensible to assume hunting or target shooting, but the tighter spot is most useful at longer ranges. Night wildlife spotting (if spotlights are suitable) would be a good use case, and I could see a role in an emergency kit for some activities, but for everyday use many seem rather large, and the smaller ones don't seem to have very good battery life.
As for eye hazards, modern high-brightness LEDs are hazardous already with some lenses, at short ranges. There's no extra hazard from the laser itself (it's focussed into the phosphor and what little is reflected is divergent), but the tighter beam means the eye hazard extends further. In practice this could be an issue, but just dazzling someone is far more likely unless you do something silly like pointing it directly at their face.