Also they need to add a special coating to reduce lens flare
The lenses are already coated. Flare doesn't come from a lack of coating, it comes from a bright source of light that strikes the surface of the lens and then scatters into interior surfaces on lens elements. This can either be a very strong light source that the camera is pointed at (such as the sun) that overpowers the rest of the image-forming elements, or it could be that the bright source is not seen in the image, but it is striking the front element of the lens at an angle, which then sends non-image-forming light down the lens and to the sensor, adding an image of lens elements on the way.
So generally if you don't want flare, get a lens hood or don't point the camera directly at a point source of light.
Flare comes from photographers who overpower the coating by their photographic technique, whether intentionally (hello, JJ Abrams!) or not.