The existing presumption means the courts start from the position that a parent's involvement is a good thing unless there is evidence it would cause harm. Unfortunately, this has led to contact being promoted even when there is evidence of domestic abuse. The courts are supposed to prioritise safety in cases involving domestic abuse, but a review last year suggested that the presumption was getting in the way of that. This change, when it is enacted (and we don't yet know when that will be), means that every case will be looked at on the facts with the child's welfare and any risk of harm being the primary consideration.
Only time will tell if this achieves the desired change in the way contact is handled in domestic abuse cases. There is good reason to believe it will, but we can't be certain until it is in operation.