"If it works in bad weather why change it when the visibility is good"
Well- a two or three autopilot autoland works well in bad weather so why change it for a manually flown approach and land whenever you feel like it and conditions permit? If you're going to use that "works in bad wx" argument you might at least be consistent!
I did try the system before I knocked it - never could understand why 12 change-overs of control between 2 pilots were needed on a double Paris when it was COK at both ends.....