Avigilon is the only largescale camera company, that I'm aware of anymore, actually building in the U.S. and it is something they should have pride in.
I've often wondered why that is. How is Avigilon (and Pelco before them) capable of rolling in the US where everyone else has to go to the cheapest labor market possible. Avigilon cameras are more expensive than Hikua for sure but they are well below the price range as the Axis Q series or Panasonic (not Advidia) products.
Maybe the reason for having 4 cameras in the same direction is that they show same FOV but with different resolution so you can see the pixel and picture quality difference - i do believe that the makers of 30MP cameras know what they are doing :-)