Part of the issue is the self-esteem of the parents and their confidence in parenting. IF we tell them we need something different than what they are doing it is akin to telling them they are doing it wrong and most people do not digest that info well. Asking us to do the same as them is really them asking us to validate their parenting.
Problem is what works for one child at home does not always work for group care and parents need help transitioning from the concept of the world revolves around their own child to the concept that at daycare the world revolves around the needs of children in general and that can mean compromise for everyone including the children.