It's definitely a poor show from Mazda and their engineering design team. As we all know Mazda have in the past come up with various fundamental issues such as a sad lack of corrosion protection, paint that scratches with a hard stare and the NC with it's notoriously bad suspension geometry alignment from the factory, that said, they have not really had any major issues with key mechanical component failure after low mileages.
I do wonder if approaching Mazda UK asking for some answers may give some insight, especially if a similar letter were written to Fiat UK re the issue on the 124. My experience with Mazda UK might suggest that you would get two very different answers regarding the failure of the same component on essentially the same but differently badged vehicles.
Just a thought.