I would say there are two big benefits. The first is that it permits early intervention because it allows people such as neighbours and friends to go to the police with information, and it's a basis for the police to actually do something. He has taken the tires off of the car and won't let her go anywhere. It's that sort of thing.
The other thing is that it names and makes visible a behaviour that sometimes is treated as not really anything because it hasn't escalated to violence.
It has those two benefits.