Back in the day I used to play Warcraft 2 over Kali. A popular strategy was developed called the “wall-in”. Perhaps you’ve heard of it, perhaps in a more recent game? To execute a wall in, you’d build farms to close the gap between your town – and it’s precious, vulnerable line of gold-mining peasants – and the outside world so that if some punk tried to pull a grunt-rush, you’d be safe and they’d have wasted their time. When you were ready, you just had a peasant chop a tree next to your farm to open it back up to access the outside world to expand.
A similar move has existed in Clockwork Empires for quite some time now. It is possible to build absurdly long, skinny buildings at very low cost due. And enemy AI treated them as untouchable, impassible barriers. So you see the problem here: cheap, invincible walls. At least back in Warcraft 2 the walls were legitimate buildings that would be attacked automatically.