In reply to Adam Lincoln:
I had the exciting experience!
Got to the sloping ledge to find it was wet - had to hand traverse it rightwards for a way before I could get on to it.
The other E4s (Running on Empty & Boy Racer) are much more reasonable for those compared to soft Welsh grades
The "problem" if it is one, with Raven Threshthwaite is that the easiest route is a hard E2 so it becomes self limiting in that there's not that many interested in mountain routes these days and even fewer at that level so they go for the low hanging fruit. Even back in their heyday, the 1970s & 80s most Lakes mountain routes weren't "clean" in the sense that every hold and runner placement were obvious. Lack of traffic is only going to make them worse. It just needs people to climb with a soft brush and clean as much as they can whilst they climb.