Neat little article. (Tone is a bit much, but neat still the same.)
What I learned from tying my own leaders for years:
2x (.002) is a good general rule.
If the material is large diameter, + .015, then you can get away with .003, or .04 jump if you are +.020. (the tippet pops well before the strain affects these knots)
If the material is very fine, like going from 5x to 6X tippet, then a .001 jump is better.
If you are going from a stiff material to a limp material, (stiff leader and a long soft tippet) then stay with the same diameter or .001 jump only.
Shorter, heavier leaders for streamers and big flies are a lot less complex than a long leader for tiny dries or nymphs.
Funny thing about tying your own leaders, there is no one way to accomplish anything.
There is no one leader that does it all.