Sorry about the rant. People had the same opinion that we are seeing with China with German cars from 70 years ago, Japanese cars 50 years ago and Korean cars 30 years ago. All of them ended up taking huge chunks of the auto industry, but were called "junk" when they first came over. There is definitely "Chinese junk" these days, as there was with things from other countries years ago. It is never good to dismiss everything from somewhere as "junk". To me, hearing that is a sure sign you are seeing the next big competitor and if you want to compete you need to be on your game.
I have a sort of hybrid view on these parts. For something like mechanical or engine parts, I ONLY use factory parts or known quality suppliers like ARP fasteners, Mahle Motorsports bearings, etc. I don't even like aftermarket clutches. If those parts fail, the results can be catastrophic, and the aftermarket doesn't have the same standards to build to. I am starting to see even German brands, like Hengst, Mahle, and Mann now come from China. Would I prefer if they came from Germany, Hungary, Poland, Italy, etc., like they used to? I admit that I do, but as long as the quality is good, I won't argue about the source.
For body parts, I ONLY use factory fenders, bumpers, etc. In my experience, the aftermarket stuff never fits properly, or is as quality as the factory stuff. I would take a used factory bumper or fender over a new aftermarket any day. I would not trust an aftermarket Golf R bumper.
For trim parts, interior and electronics, I am somewhat flexible, and am OK with aftermarket if it something that is not function critical and I am willing to risk a little where things don't matter or can easily be exchanged with the factory parts. For example, my driver side mirror turn signal repeater was cracked on my R. Factory part is $60 or so as I recall. For $40 or so I got a set of aftermarket repeaters with sequential LEDs and puddle lights that fit perfect and look a bit more modern. I really like the puddle lights at night. If I want, I can always replace them with the factory parts, but I see no reason to.
As for the grills, it sure seems to me that the ones that I got are factory parts. Even if they turn to dust though, I am only out $60, and a new set of the grills from VW will easily go right in.