This isnt really true. Its just that there are more people who consider themselves "Specialists" in hondas whereas for some bizzare reason mazdas arent held in high regard here, due only to the fault of the Agents who are utterly crap.
Now however there is a place that specialises in mazdas and is supposed to do pretty good work. Finding parts was never an issue really, apart from maybe interior trim bits and such, but by now even Eg8's have the same issue. Its due to the ages of the car.
Just because a bunch of people say something, that doesnt mean it's true.