The Median Ringer
The more interesting question is what is the median point for those who lave learnt to ring in about, say, the last decade or two?
I think it's worth distinguishing between "can ring reliably, bobs, singles & all" and "working towards it". I suspect PB6 is not the median for ringers in the late-starters group. PH5 is more likely I think.
I think that anyone who gets to ART level 5 is a bit of a star. How many new ringers get much beyond that?
Last time I looked the attrition rate between L1 and L5 was 95%. If that isn't a sign that things aren't working in the upper ART stages, I don't know what it is, but it seems to pass without comment, let alone action.
ART is great up to around L3 but unless you live in an area with lots of active towers and strong bands, it's pretty much useless beyond that. The ART syllabus becomes much more spotty and the over-reliance on QPs is a mistake IMHO. I've got to L4, if I squint at the requirements hard I think I probably need one QP of Grandsire5 for L5 but I've already rung 2 QPs of the "harder" PB6 and I've taught myself or am learning Kent, Oxford, the other 4 Oxford Group methods, Stedman, Grandsire and Norwich. ART has been almost completely irrelevant to me for several years and if I get to L5 it will be as a by-product of other ringing I'm doing, not because of it.
If ART's goals is to get people ringing CC & PH for service ringing than I'd say it has been a great success. If it's to produce method ringers then it's an abysmal failure, even judging by their own stats.