When used on -friendly land- (as in claimed land, either personal or village, on which you have permissions), it should be more effective.
Our village has been trying to take down our old palisade, and its taking ages because each wrecking ball only takes down 1 piece of wall.
We are using 5 w-balls at once, and most days we get 1 piece each. On our luckiest day, 4 balls took down 1 piece, while the last one took down 6 pieces.
This makes village-remodelling/expansion very tedious, and I don't see a negative side of making them more effective if used on friendly claims.
To make it even safer, you could make it work this way for the owner of the claim only, in case you're worried about some kind of griefing from villagers or whatever.