This is an excellent reply, more interesting than my comment, and I certainly cannot gainsay you. However, '100' might as well be 'n'. Your reply suggests that there is a struggle to maintain contextual awareness of 'n'. In this model, for everyone, there will be an n+1, a necessary factor where the diminishing returns of mastery do not justify the cognitive load. I do not think the heart of your dispute truly lies so much his model of peripheral necessities as with his ranking of git as an n+1 tool.