Alright Captain Obvious.

Design alone is horseshit. Engineering alone is horshit. Blogging alone is horseshit. Marketing alone is horseshit.

But put these together in the right proportion and you get a beautiful product. The proportion depends on your product/service. It takes a lot less selling, if the visual design of the product is impressive. It releases dopamine in your customer's head which urges them to put their credit card number in the checkout form. It may not be important for enterprise product as the person signing the cheque does not use your product. But it is vital for consumer and small business based products. But I agree with the author that pretty design is not a substitute for good engineering, good customer support or good marketing.