While it is true that CAT II/IIIa does not necessarily require autoland capability this thread was about autoland, not the nice to have backup systems in bigger planes and the only possibility to fulfill the requirements for CAT II/IIIa in smaller ones.
There used to be some recency requirements for pilots (6 autolands in 6 months on the real plane, basicly one each month for both FO and CPT) in my company, however that has ben waived and nowadays simulator training every 6 months is sufficient. If the aircraft needs an autoland to keep its CAT III currency the engineers advise us about it, some airplanes print nice little letters to us about it automaticly too.