I think 4days of some what leadership training is not enough, I think there should be 3 tiers to a WB. When I was a asst scoutmaster back in the 90's I looked at it hard. But we had camp Merrill (5th RTB) that actually gave you better leadership training, and skills that you could take back to the Troop level.
It lasted a straight week in July when the school shut down. The Rangers had a very active role in the Northeast Georgia council in the Boy Scout capacity as well as the Explore capacity.
I think Giving the skills to leaders is essential and especially when as a parent you are trusting another adult with precious cargo. So knowing that this adult is trained a little above the standard and that they will be safe in a Backpacking, Water, mountaineering type of activity.
It also was designed to give some adults who have never had a chance to lead or been in a leadership role some guidance. But to someone who has some type of leadership role daily will find it trivial to say the least. That is why I think there should be a 3 tier system of training to the wood badge and make it more unique and challenging as well. I mean look at this way there is that old saying " do not tell someone to do something that you are not willing to do yourself" so doing that 50 mile a foot. 50 mile a float you have the skills to deal with oh" it" factor when it happens.