This is shifting. First, economic stratification is getting worse, and as economic mobility declines people start looking for alternatives. (See all of Gen Z cheering for Luigi Mangione). Second, AI will enable people who are less educated to build these kinds of weapons.
For example, you can use a Kalman filter to greatly improve the data you get from an IMU and GPS via sensor fusion. Before, this required a specialist skillset; now you can get a "good enough" implementation by prompting Claude.
I really wish the debate around this stuff wasn't framed in terms of preventative enforcement because it naturally leads towards more enforcement (when your only tool is a hammer...). The root of the issue is that the government does not trust its citizenry to follow the law without Big Brother watching. That in and of itself is a symptom of a larger grave political crisis in America: the decay of the state's political legitimacy.