True enough.
Except in my mob, we only use the centre autopilot for flight.
All THREE A/P's lock in for an Automated landing...assuming they all work. If all 3 do work, then you can operate to CAT3B minima. If only 2 work, you can fly to CAT3A or CAT2 minima.
Or something like that. In essence, the more functioning autopilots you have, then the lower the minima you can fly to.