A "Brand" puts its corporate name behind every product - that's why branding works: The company's managers know that a mediocre product will impact brand perception and thus lessen their future sales of other products.
Look at it this way: Do you want a Mercedes Benz or a Mystery Car? The Mystery Car may be very nice but you need to test it. The Mercedes will probably perform. Now, do you prefer a Chromebook where Google says "This is our Flagship corporate laptop for Google Apps our execs use it, and we lose revenue if it doesn't perform", or a SlackwareBook which says "Entirely GPL, some hackers run this".