I actually don't fish enough to need to replace my lines every year. No abrasian. No coarse spots except where the leaders are. That's handled with a little cutting at that tip.
Will setting the drag really help reduce cuts on the 4-lb lines?
You should still replace your lines annually
If you fish alot
Since you have many poles
And fish less on each
I say every 2-3 years
Wear and tear
You know
Stuff breaks over time
You don’t want your lines breaking
While reeling in a big one
Also setting the drag helps
If the fish is big and pulling hard
It is best to let the fish drag
Otherwise your lines might break
Heres a video
https://youtu.be/RXqzDUqIUnU