Broken surface, light/dark and backgrounds have something to do with visibility and putting down fish.One year, I tied leaders out of Maxima Chameleon , which was red. In dark waters it disappeared nicely, in clear water with the sun beating down it stuck out like a telephone pole. I switched to clear mono for the last sections. For me, the length of tippet also serves as a shock absorber to not break off bigger fish (longer tippet-better elongation) . I consistently will try to err on the side of caution. I agree with AA about leader butts not being as important. I do tend to follow the same train of thought as Darrin, though.
Charlie