Exactly
@ducky . For the most part it has to do with quality control, to the point alot of OE-type aftermarket parts are basically the parts that didn't meet the QC checks, or parts that were manufactured at secondary suppliers (lower tier suppliers that sell parts to the manufacturer when the main supplier has a shortage or otherwise can't fulfill the needed amount of parts. Generally these suppliers don't meet the same level of QC.) A rep for Alpine once told me that is how they source, take that as you may. However that's why I don't stress about the DOT rating on the box when and if a customer wants to use Alpine or requests and inexpensive part in which case I may suggest them.
Might wear a little faster, might dust more, rust more, squeal/squeak/make noise more, etc.
However they aren't a guaranteed of failure by any stretch of the imagination and for many drivers the differences are un-noticable.
If Chinese parts were bad quality/caused failure Toyota wouldn't use them, but they do. The reason "luxury" manufacturers don't has to do with QC and product differentiation/pricing justification. The Supra has Chinese sources parts and the Z4 has Polish. Do you really think the Supra is the one with a greater chance of having problems? Cool.
I don't use Alpine or TopEuro parts on my cars but when a customer requests them, I give the warning about less QC and possible convenience/appearance/sound/durability issues then do what the customer says. Never had a problem with that, lots of happy customers.
Do what you want, educate yourself, try to do it without prejudice though.
Gotta go test drive and Acura now....gotta admit the RDX sounds interesting, want to drive it.