I agree with your statements, Robert. It's a complicated situation when you provide this type of product internationally. It really depends on the type of product.
For example, let's say you bought a stereo from your local electronics store, take it home and plug it in and discover that it doesn't function. Guaranteed you would not phone and complain to the manufacturer...you would pack up again and take it back to your electronics store for a replacement or refund. Try that with a model at your LHS. (Most have a policy about open packaging, but I have heard LHSes occasionally take back merchandise, but I can count all of the times I've heard that on one hand). In my years I've had hundreds of kits, and offhand I would say that Lindberg, AMT, and Airfix are the biggest culprits with malformed parts and quality, however, those manufacturers seem to be the only ones who made the sort of kit I was looking for in the genre and scale I was looking for. It's frustrating, and I vow never to buy another kit from them, but when they are the only one who manufactures a particular item I desperately crave, I usually give in and hope that I get a "good" kit next time. Personally, Tamiya, Dragon and most recently Bandai I would say have been the best at quality and parts being intact with Tamiya being the best. (I haven't purchased any Trumpeter kits but I've heard they ar excellently).
Known problems on the production line are sometimes slow to resolve, since some companies may not have high tech quality control technology at their factory and it may be months before customers purchase the kit (and In my case, many months/years before I build it). By the time customer complains roll in the factory is already are producing other kits. I have seen the result of extra channels being cut into the moulds to accommodate better plastic flow.
In short, there's not really any answer I could give to solve the issue, and each company has to decide what their customer service policy is, and of course, we ultimately decide which manufacture to buy kits from. No offence to Moebius, but they are the little guy in comparison to large firms such as Tamiya, Revell and Bandai. If damaged parts from a manufacturer happen often, let the manufacturer know through a wisely worded email.
TazMan2000