To be clear, officials may understand that an architectural decision could have an exclusionary effect—they might even intend that result—but they generally do not see their decisions as a form of regulation that should be analyzed and patrolled in the same way that a law with the same effect would be.
How could one regulate this? Because it is such a powerful and potentially harmful tool, it should be analyzed and patrolled, but it's impossible to argue knowledge of intent. I'm not saying it's wrong, but it's near-impossible to regulate.