Sure there are uses :
a battle continues longer.
For example an naval invasion . That gives your air-force time to do more damage, so that you can take the Port
Another use is if you really have to stop an enemy division from marching forward: You attack it with one division and do to force attack they stop them long enough that you can move new divisions into the way of the enemy Division.
You only have infantry but need to push the enemy back. Force attack helps here to keep the battle open. Thats especially useful, when the enemy has only 1 division in the battle left, your org is running out and starting a new battle with new divisions would bring more enemy divisions in. If you are lucky the last Division gets pushed out and you get the province.