I get daily, lots of Magazines for my wife.
Magazines are pure PDF.
She flips through them and delet them one by one.
It is a one way streaming Magazines into the iPAD.
I keep a library on my PC with a Date title of the magazines I uploaded that day.
( I clean it after 3 days)
So why do I need that sync.
Same for books.
I have on my PC a library with 145 ePUB books. It is there to be kept. ( Have them also on a CD for backup)
Why do I need it on my iTune library as well.
I like my Book/Magazine iTune clean, so it will be easy to see what I am moving through it.
Sorry.
I am from the PC world. for me "Syncing is Stinking"