samcat116 parent
It largely is due to physics. There's a reason a Canon 24-70 f2.8 lens is the size that it is.
My Pixel takes reasonably good images, even printed some in A4, at A3 they suffer. That is for the camera generated JPEGs, the RAW files are all but unusable.
It shows that smartphones use small, and crappy, sensors behind even smaller, and crappier, lenses. Phone got a long way, and there is a reason they replaced point-and-shoots. They are still a far cry from "real" cameras.