I have to say, i dunno about cyclecraft, but I do think that spending money on stupid unusable cycle lanes on roads means it isnt available to be spent on 'off road' cycle lanes..
i was commuting bolton to manchester and some of it , i used ncn6 , for part of the route, its great , fairly straight, gravel ( not too bad) and nice and clear in the woods... but into manchester it then follows main roads with heavy traffic , has a couple of stupid junctions where its non-obvious you have right of way ( ie, one way for cars, but cycle lane goes opposite , across a heavy junction),
whats stupid ,is that the money they spent, could have followed a different off road ( the path down the side of the river) which would have been segregated..
what they've spent, doesnt make the on road cycling any safer, but that money could have been spent cleaning up and making clearer bits where the route follows footpaths and also the bit outside the m60 which is a muddy bridleway...(okay in the summer,but in the dark winter, not so okay)..
personally, by all means stick paint down , but rather than spend thousands on reworking roads which aren't usable , spend the money on segregated routes to follow say old train lines or perhaps more direct routes of other kinds...