I can make the wood walls destructible, but there's zero reason to do so
Well it takes up a resource to build the wall, so I was thinking that with later wall recipes the cost could go up and by that point you might want to destroy a wall for material so you can build something else. That, or you make too many walls and you want to delete one so the build doesn't have stragglers. Of course that depends on the direction of the game, I don't even know if it's going to have monsters to defend from or what.