I don't know.
Why do some guys put red hooks on crankbaits?
Or draw a black dot on the side?
Or dip the claws on a craw?
I guess it matters to them.
this is exactly the reason WHY any fisherman does anything to their lures or line or use a certain rod or reel.
it really makes no difference today or tomorrow in how or why you catch fish other than giving yourself more confidence in what you are doing.
when the fishing is tuff,,, I go to a Blackmore 1/4oz Roadrunner with a white grub and a red dot on the side AND I catch fish. Noone else will do that so why do I do it ? CONFIDENCE ........ Black Sharpie to any line ... why? CONFIDENCE