And so was I. The OS's looks, aesthetics and colors are all a part of its UI. The customization aspect of the OS directly relates to its aesthetics as well - it determines if the aesthetics part of the OS can be personalized or is it streamlined. OP was suggesting that the main colors of the OS apparently caters to Asians, and I was retorting that a color palette won't do much in luring people over, because the fundamental concept behind iOS (simplicity and intuition) differs from what appeals to Asians generally. And this a very generous description, although less stereotyping than OP's suggestion - that Asians love bright colors.
And the Asians' love for customization comes from cultural differences. There are a lot more choices when shopping for anything in China, for example. It's true that compared to Asians, Westerners prefer simplicity, functionality and just generally utilitarian things, and that's why color appeal may seem like a cultural thing.
Edit: And OP clearly stated that this whole OS is designed for Asians, not just the color palette.