9.G
Confusion certainly does exist. You can operate a Cat 3A with fail passive and still only need 75m midpoint (EU-OPS) as fail passive does not imply rollout guidance is lost. The 125 requirement is for midpoint only and is only applied if you already know you dont have rollout (through technical/ice covered runway etc). It has nothing to do with whether you are passive or operational.
So I return once again to the question of why no Cat 3A DH ? You correctly describe why 175m is insufficient for a DH to manual. Australia must therefore require a CAT 3A to be flown only with a fail operational system. Do they ? The FAA do.
Thus if your operating no DH then you have no requirement to see the runway to land so you must therefore be fail operational correct ? So no need for the 175m !
p.s we apply standard EU-OPs minima to Melbourne. US is a little more complicated.