SO TRUE!-Some people are so blind. One sided relationships are way too common. And what sucks is that person won't realize it until they have lost a friend. If they even care, which they don't, or they wouldn't have let this happen in the first place.
If both parents truly support shared parenting the effort towards making that happen would be equal. Bashing the other parent or fearing the kids might like it there too much is not an equal effort. Doing what is best for the child is an equal effort.