I see the value in a leadership course. I personally have seen adults wise in the ways of the rope, axe, and dutch oven who chase boys away from lack of leadership skill.
I still regret the lack of any BSA course that goes beyond the bare introduction of IOLS - which now does not include first aid. I believe that more competence in Scoutcraft, given an adult who can lead and understands his role, should lead to better program and, thus, better retention of Scouts.
I can hope that the effort in the third version of WB to motivate and inspire may lead Scouters to learn more on their own. The information is certainly available.
As for "it never was," the first version of WB was expressly designed to teach the Scouter how to teach "Scoutcraft" through First Class. I witnessed that version as "Junior Staff" (an experiment that did not result in permanent change until the third version of WB) and have the course syllabus. As a result, the course was about 90% Scoutcraft. As the "learners" were mostly quite experienced and Scouting was still "Bill Scouting," they needed little teaching about the Patrol Method and the Outdoor Method."
The second version of WB (circa 1972), which I took as a "learner," in 1984, was built around eleven "Leadership Skills" but still used perhaps 1/3 of it's time for advanced Scoutcraft skills. (Helicopter Chicken anyone?)
WB COULD be used to teach the Patrol Method, but it ought to be taught at the "basic" level since it is fundamental. As it is, WB assumes the participants know about the Patrol method when few actually do. Certainty, some at National Council could use the training: " Patrols are one component of what we call youth-run, or youth-led, troop." Others at National Council are Patrol Method champions and are fighting the good fight for Boy Scouting.