A "favorable situation to work with" might mean that the two parties can rationally discuss things and plan for the best results for the children. (Didn't happen in my case, but I know a couple that did things that way.) It could mean that the facts of the situation are so simple that there's no controversy. (Such as having no assets, no kids, and no fight.)

In some cases, just having one parent leave is not bad. I know of two divorces where the wife received the family car as the divorce settlement, left the state and hasn't contacted the kids since the divorce.