It usually makes more sense for sensors to be closer to a circular shape (i.e. square aspect ratio) because the image projected by the lens is going to be circu

It usually makes more sense for sensors to be closer to a circular shape (i.e. square aspect ratio) because the image projected by the lens is going to be circular anyway. So if you have a very wide sensor you lose a lot of light on the top and bottom in order to expose the sides correctly.