“dangerous paths”, yes…
There are several ways why paths can be dangerous. If they are paths at all. So there’s a few problems already. The solutions that can be drawn just from those two sentences:
mark ways that are not clearly visible on the ground as something else (pathless?)
apply a difficulty rating (used to be the SAC scale, so at least there some international standard) so that paths can be displayed differently on a map and people know what to expect
use additional tags (visibility, smoothness, incline, surface) to indicate what is it makes the path difficult
As Alan noted, the point is not to remove these from OSM but to have them distinct, just like there is a clear distinction between a 6-lane highway and a dirt track full of stones in the middle of nowhere.
But definitely we need to set a list of goals and get into shaping them. There were a few recent attempts at that, too:
Perhaps we could refine the goals based on the feedback since then.
The issues I see so far is: