Because of its long middle section with lots of options for deviation, I doubt that the whole of this route can rightly be described as being the same pass. The Langdale side as far as Angle Tarn can certainly be called Rossett Pass, but then you have the erroneous section which crosses just below Esk Hause, past Sprinkling Tarn and down to Sty Head. Once at Sty Head the route more or less hijacks the Sty Head Pass route into Wasdale Head. Despite our modern way of over analysing things to create confusion, this was in fact a route used by the many packhorse trains that criss-crossed the fells in days gone by. For what ever reason however, it failed to achieve the 'official' name of Rossett Pass; whatever official actually means.
The expression 'Beggars can't be choosers' comes to mind with Rossett Pass. The simple fact is that there just isn't a more straightforward route between Wasdale and Langdale than this one and as such, anyone needing to cross between the two valleys had no choice but to take this option; as difficult as it may be. Fell walkers today relish the thrill of the crags, the precipices and the successful crossing of large area of rocks and scree on the Langdale side of the pass, but lets not forget the men who pioneered these routes which we have adopted. They didn't come here for the thrill or for any sort of enjoyment, they were the HGV drivers of the day, transporting good across the country using packhorse trains. This was hard and often dangerous work.