As precautionary measure, it is worth following these advices.
That said, it is also worth sending the lens you use the most along with the body, if you want to match a particular lens with your particular camera.  It is done on the firmware basis, not in the user-updatable fimware, but on the deeper level.  After the calibration, you are no more in need to fine-tune the AF from the camera menu.  I've done that several times and am very satisfied and pleased with the results.