The lidar vs cameras arguments are good example of this. This is a technical engineering question that could go either way - maybe cameras are good enough, maybe you need lidar, nobody on the internet is really in a position to judge.
But Tesla did it with cameras, and everybody else is doing it with lidar. Therefore to Elon fanboys that's the smart way to do it; and to Elon haters that's the stupidest possible way to do it. And they'll make it part of their political identity and spend thousands of pages arguing about it.