Deadshade, while I agree with your general message I would have to say that in my personal experience it helped to color my first BW mountains to see how colors work together with linework. Before I always added way too much lines(still do ) than necessary and only when I did a first few tutorials by Max and others I saw that I dont need as much lines and I think i started having a better sense now how my BW linework should look.
So basically I think it isnt necessary to perfect each step before moving to the other but actually doing all the steps once with the basic skills helps to see the whole picture.