Originally Posted by
excrab
So from that it is evident that at some point prior to the accident, someone in Flydubai had done a cost analysis and decided not to use dual channel approaches and instead to use the HUD. If that still isn’t enough for you there is nothing else I can add.
excrab, sincere apologies. I could not have been more wrong. You are correct on all accounts including my previous type setup. Baffling, both in the original and quote of your post, I mistakingly read it as if
the airline decided against dual-rudder (fail-operational) option electing to use the HUD instead, and that also for CATIIIA approaches. 
Ironically, in the imaginary world where I had a say on how to sketch an airline, purchasing HUDs that would make the approval, trainings and maintenance of autolands obsolete is an idea I'd wish to explore.