It is actually a practical problem when people use things in an unintended way to create a loophole problem. As an admin on a few multiplayer servers its a pain in the @%$*#! to see exploits being used to circumvent 75% of the gameplay.
The game gets kinda broken when you can build blocks that zombies wont attack. Have the devs put much time into fixing the "impenetrable" base designs. Like using the upside down arrow slits around a base or the steep wedge walls that dont get attacked by z's?