So are we saying that it's a bad idea to improve the look of your car if it is going to have negative effects on the performance?
It's a bad idea to do anything to your car that will hamper outward visibility (coffin-tints and HIDs in reflector housings), driveability (huge mags on ultra-soft stock suspension (makes for interesting handling), cut springs) or reliability (knock-off parts that may just come apart).
Though, I do say, not all Taiwanese parts are crap. For some of us with cars that are not sold in the US, there are quite a few Taiwanese companies that produce self-researched and manufactured parts that no one else does. Need underbody bracing for your Hyundai? Or how about individual throttle bodies or a supercharger for your Protege? Stuff like this is available exclusively from those makers.
It also helps for those of us who don't have a Honda to have sources that will build copies of parts from defunct companies or suppliers who will no longer manufacture that part because they have no interest in it. Though there's a line between serving an unfilled need and piracy.
I'm on the fence about rim designs. ROTA is produced not far from my weekend place, and, yes, they do build copycat rims, but they also produce reproduction of old rims that are not being built by the original maker, anymore. People like them because they're light, relatively durable, and disposably cheap. They've strayed over the copyright lines a few times, but have recalled or amended a few designs due to copyright complaints.
Personally, I don't give a flying fig as to what name is on my parts. As long as they work well and are durable. My entire exhaust and intake is custom-made and bent (legal here, and I pass emissions), whereas my engine management and cams are brand name. I have one self-manufactured cam-gear matched with one brand-name one.
My braided brake lines are custom-built, brake pads are Hawk, but my brake discs are Taiwanese. They're not copies of anything, they're new, relatively inexpensive parts developed by a company there which sells OEM-sized slotted rotors at a price just above OEM. Works well enough for me, since I never do more than three to five flying laps, anyway.
My car is overkill for street use (noisy, stiff, jumpy on throttle and brakes), but I don't see the track more than once every three months (at least once a year). I don't see a problem with that. I do feel bad to see cars with a ton of mods that aren't even driven hard once in a while, but some people just like the feeling of a little extra power, or a little more sureness in the handling... Sure, you're not going to drive at 10/10ths on the street, but a well set-up car is infinitely more pleasant to drive at 2/10ths in traffic than a similar stock car.
Well set-up meaning it doesn't have the spring rates of a Hummer on a body the size of a shopping trolley...
I don't really care much for cosmetic modifications, beyond your typical shiny rims... but I can appreciate a well-built show car. 👍