Been watching this with some interest. I've been shooting for around 3 years now and gone from very erratic C class through to a steady B and now 'hopefully' scratching on A.
I've had a few lessons, with a few different coaches and these have been invaluable to any progress I've made. However these sessions have been supplemented by doing a few registered shoots with the same coach who did give advice before each stand.
However he never once mentioned lead but instead focussed on my hold points, foot position, target speed and angles etc and the advice was always given in a sensible and appropriate manner.
From personal experience I do feel that coaching on particular target types on a practice basis is great, but advice in context at an actual registered shoot is vital to help beginners progress. I appreciate this may not strictly be within the rules and there will always be 'grey areas' but without this I would certainly have got tired of getting spanked at comps and packed it in long ago.
I've never 'won' anything despite the advice and I often shoot birds only anyway, so I'm not in it for the money but as long as it's kept sensible I don't see its a problem. I certainly don't get upset about it and I see it most weekends.
Just my thoughts.