Branding/decals are important for potential customers who are apprehensive of Far East products.
I am in constant communication with basically every single race organization here in Chicago. From the amateurs, masters, to the elites who race in Europe. You see won't any of these see folks racing their bikes with Chinese consumables unless they have already seen these products being used within the peloton beforehand. Or from influencers like myself who actually race too. Somebody has to be the first in order to validate the performance. Or at least confirm said products aren't a death trap.
Sure Winspace, Tavelo, QuickPro, and No.6 Wheels are subjectively expensive to forum members here. But they are proven products at the competitive level. No one ever asks me about my unbranded frames or wheels. Why would they? But they sure as heck ask me about my bike when there is a humongous holographic "POLYGON" decal along the downtube.
That being said...there should be great care into developing the decals. No generic fonts and no "Ch-english" naming conventions either. To me the decal and font design is more important the intangible branding itself. But I'm no professional designer.