Folks hate the VNL because it's meaningless and unimportant, and it steps on the nineteen thousand Euro-Tournaments that gotta get played. It might have an unexpected benefit of improving countries' National Teams by forcing them to try new players in a NT to NT context that has international razzle dazzle--because everyone needs rest after the Euro-Stuff ... and it's meaningless anyway.
Maybe not. Maybe it's better just kept in house (Europe) where the teams are better, the players are better, and the competition is tougher. Players improve more in those circumstances. And the Traveling isn't as sucky.