Information from various sources tells me that this route was used for many centuries as a link between Watendlath (Borrowdale) and Armboth. And although the Armboth side of the route seems to hold no real significance these days, this was not always the case. Prior to the flooding of the valley and the subsequent creation of Thirlmere Reservoir there was a whole community of people to be found at Armboth, and another one further along the valley at Wythburn. With this in mind, we can well understand why a direct route was needed over what we now call the central ridge.
The central ridge of Lakeland is commonly regarded as the wettest area in the national park and because of the wet and boggy character of the place, this pass defies all convention and aims for the highest point instead of the usual low point on the ridge. Anyone that has walked over here will understand why, and no doubt agree that this makes total sense.