It's a kiting myth.
I've ridden with crossed-up lines for freakin years and I've never noticed any wear.
However, if you tangle up with another kiter you might experience kite-burn.
That's when lines rub together and cause singeing.
Sometimes newbies worry about crossed-up lines after they've thrown a backie.
My advice is to spin the bar first before throwing a backie.
Then your lines will be uncrossed when you land the backie.
But remember, don't spin your bar the wrong way, ok.
lol.
Interesting,,,,I cant work out how he is going to somehow tie this into "dont use a death leash"?????Dude
my experience is opposite to this. all my lines show wear and tear at the section were they loop together. they get fluffy.
but i like to do all sorts or loops in every session mayeb as much as 20-30. so perhaps my wear and tear is alot higher than an occasional looper.