I think Ard's pretty much nailed this one.
But do I use 'specific lines for a specific rod for a specific application?'
You betcha! But all most all were custom lines done by Steve Godshall here in the Valley. For context, 95% of my fishing is with a 2hander rod and all are/were designed/cut/built for a specific purpose and rod.
First time out with a totally new set up on a Sage 8136-4. Two flicks and the whole thing is a Cannon! Price of the line? Not a penny more than something off the shelf.
Only issue I had with the set up is my young fishing Buddy Nate Bailey reels in and walks up and does a "WOW can I try that?"
Damned guy could cast further than I could ... and I taught him how to cast a 2hander.
This is NOT good.