What's driving this? That's what the article is about. Is it actually pull from customers, or is it push from the manufacturers? Is it: people all actually demand boring white soapbar shaped cars -> companies make boring white soapbar shaped cars? Or is it the other way around: Companies are economically incentivized to offer only a small number of colors and styles -> customer really doesn't have a choice -> customer buys what's available -> companies think that's what they really want because of their purchase choice.
Same with the AirBNB look. Do people really like it, which translates into more rentals copying the look? Or are the landlords just uncreative, all copying each other, and that's all that ends up on the market? Or is something else driving it?