Well, it has to be. That's what everything is based on here--the children. We have adults who have chosen to disagree and go different ways in their lives, but we have young people who are caught up in that. The courts have come into play to deal with this as the tug-of-war gets started.
To make tools available that are better suited to deal with all the situations that exist goes one step further. Certainly this doesn't answer all the questions.
If a judge, for any reason, doesn't think it's in the best interests of the child, then he will rule as such. All the facts would have to be placed in front of him by anybody who is seeking to change an existing order.