Yeah, my point isn't in 1970s EPA regulations but rather the last 10-15 years, where so much--particularly interior design and cars--have gone completely greyscale. Otherwise what about 1980s postmodernism, or '90s vehicles with funky green and purple shades?
dwash is correct in pointing out how flavorless car color choices have become... black, white, grey, silver, dark blue, dark red, and then maybe a bright blue or red. I know all about resale values, but there's more to this trend than just the number you can trade your vehicle in for. We've become incredibly color averse.