I think it's far more likely that there are numerous 1.5x improvements to be made along the entire funnel than that there exists a 10x solution at any one point

I think it's far more likely that there are numerous 1.5x improvements to be made along the entire funnel than that there exists a 10x solution at any one point. Making each person who 'owns' a piece of the process accountable for optimizing their portion is going to yield far better results than passing the buck.