basically, you explained the relationship between rod action and loop formation excellently. but that wasn’t his question. his question was why it was easier to pick up more line with the new (faster) rod. similar, but not quite the same thing. thus, the similar but different explanations.
i disagree with your “theory,” however. casting rhythm isn’t a function of worldview.
it is a function of the way you were taught and on what rod you were taught to cast. it’s like the impressioning of a migratory bird. that first location is “home.” that rhythm quickly becomes impressed into muscle memory as the baseline. and the problem is the stop and the rod recovery of fast action rods. these take a toll on 2 things: delicacy/finesse in presentation, hooksetting, fish playing, mending, and accuracy; and the caster’s hand and elbow over time (sometimes shoulder, too). you’re transferring a lot of shock to the end of the leader, have less flex to create reaction time, and transfer way more shock to the joints and hand.
those who have entered fly fishing over the past 15 years or so have mostly been introduced on faster action fly rods than those prior were. so they feel more at home with faster action rods. people mistakenly consider this their “natural” casting stroke. there is no such thing as a natural casting stroke. it is a learned behavior. folks who were taught on slower rods usually prefer a slower/longer stroke. you see this all the time: “old-timers” preferring slower rods while the “youngsters” and “yuppies” (post “the movie”) think they’re junk.
you are right about the length of a lever thing and physics. my point is that the difference is negligible at 8’6" to 9’ when talking fly casting. i can definitely cast a 9’ rod further than an 8’ rod. but in stream fishing, that distance is irrelevant to me. when you can cast an 8’ 3wt 70’, what’s the point? but when i go to saltwater, i take 9’ rods due to heavier lines, flies, more wind exposure, and to pick up the extra 10-20’ depending on conditions. but did you notice that i’m casting slower action rods when stream fishing and faster in my big game/saltwater rods and not really losing much distance by switching action and losing a foot of rod length? it’s all about learning to cast the rod in your hand!
if you want to be a good fly fisherman, you need to master a wide range of tools of the trade so that you can use the right tool for the job. if you take a fast action 9’ rod to a small stream in new mexico or arizona to catch trout that avg 8-14" long, you’re gonna be pretty over-gunned no matter the rod weight. furthermore, the slower rod will out roll cast the faster rod (all other things being equal) every time.
look at it like this: i once met a guy who played golf with nothing but a 3 wood, 9 iron, and putter. he wasn’t bad, either! he was a consistent high 80’s to low 90’s duffer. but he was no tiger woods! and you would never see any 60’s golfer doing that. why not? because it is a handicap not to have a full toolbox that you have mastery over.
and now, ladies and gentlemen, you can go and explain to your significant others exactly why you have to buy more fly rods! :mrgreen: