I got this idea when making an outdoor map.
Right now it’s pretty clumsy to surround an open map with kill/safe areas or player blockers. Player blockers only exist in pre-determined sizes and are not adjustable, and kill/safe areas can only be a rectangle or a circle. So unless your map is the shape of a rectangle or a circle adding those boundaries is clumsy as you have to surround the map with several kill areas to form a wall. Player blockers are especially clumsy to add because you can’t even adjust their size.
So I thought it would be nice to have the option to freely form the safe/kill areas or player blockers when needed.