Originally Posted by Rip Tide
A well designed tapered leader (no matter what material it's constructed from) will cause your fly to roll out with a consistent "transfer of power" from the leader's butt to the tippet end.
If you think about it, this is far more important to your cast and fly presentation than any other piece of your equipment. Reel, line, or rod.
People have understood this since the days of horse hair leaders.
I agree that piece or pieces of leader and tippet are the most important component of yours or mines cast, with millions of options how do we relate this info to new casters? We fish wind and large waves down to small streams and raging rivers and we use a different rig for each, how did we come to this success, itís trail and error we can only give a starting point to the journey and it still might not be right.