Here is my example for the pathless traversal. This is an area that seems possible to traverse from the top down to the path. There is a standard route that leads to the top, from the left. Here it should be possible to get down, if you know the route. There might never be enough people to leave marks there. It will certainly not be a walk in the park. But it is possible to get through relatively easily. I would think that a worthy information on a map. But would not mark it as a path.
Where to draw the line? There where the route is optimal. In this case, where the difficulty is such that it can be used with as little skill and equipment as possible. If there is a section where you need to abseil and a section where one can get down with perhaps 1+ climbing, then the line is at the 1+ route. Unless there is a reason to have the other one, as well.
Here, the reason to add a route at all is that the nearest route to get down takes 2-3 hours vs this part, which might take only 1/2.
Once there is one route, additional ones are usually not necessary.