Quote Originally Posted by Phenidate View Post
So... why not level the lv50 down to the lower level's range and continue as such. The higher level would be unable to use any abilities a character of the same low level could not use.

Now the lower level isn't tagging along with a high level group killing high level things he shouldn't see yet. BUT. He is now playing a friend who otherwise would had to use some boring trickery like PLing to play with him.
Yep, that's exactly what level sync allows.