Not sure how many of you understand manufacturing process but replacing bad parts requires one of two things to happen. Either stopping the line and wait for the parts to be replaced or keep building product and slip the updated part into production. For Mazda to just stop accepting a part means they need to put a hold on CX-9 production (I doubt perople would appreciate buying their brand new CX-9 with no armrest and an "I owe you" receipt taped to the windshield).
Production holds are often done for very SERIOUS issues e.g. safety/reliability issues, so halting a line for a part like this is ridiculous and expensive and would likely be damaging to the supply of the very popular CX-9 to dealers. A lack of stock means people will go buy elsewhere. The alternative is to keep building CX-9's and wait for the new part to be slipped into production. Since the part is likely a direct replacement it doesn't require the line to stop. And those of us who find a problem with the part and complain (i.e. not every person who ever bought a CX-9) can get it replaced easily.
People have a tendancy to believe that it's all about them, in reality manufacturers are servicing millions of people and as a result have to assess the risk of dealing with problems based on the percentage of people who are having/cannot live with the problem. Unfortunately, crikey those who are on this forum represent a VERY small percentage- as I've said before what is no more than statistical noise- and this particular problem, in the scheme of things, is VERY minor.
This is not to say that I'm not miffed by this QC issue. I am. But I understand the challenges and compromises that manufacturers need to practice to deal witht he sort of thing. I will however continue to check-in with my dealer to find out if a TSB has been tendered. My guess is that it will be available in the next few months.
Another thing that often occurs is that manufacturers will accept a part into production (under deviation) before all the related testing is completed. This is based on an educated guess and experience that the new part is pretty much 90% of what it needs to be as far as quality but still needs to undergo the balance of testing to confirm the part meets spec. In such a case a manufacturer may choose to include the part into new production (to meet schedule and demand) and then offer it as a replacement for defective components once the testing is finalized. At least that's what I've epxerienced at some places I've worked.
IMO FWIW