There's good marketing and bad marketing... same as engineering. But marke ting is done whether or not you have a department for it. Someone needs to find out exactly what is and is not a good idea to design and will sell. Only then can the engineering dogs be turned loose on the goals.
I've worked for several companies that got good intel from the marketing de partments. They were the guys out there pounding the pavement looking for the good ideas.
Often marketing has data to defend their preferences. Laptop makers have d ecided to trade off functionality in laptop keyboard design for aesthetics. I'm sure this shows up in the resulting sales figures so they doubled dow n in their efforts and have been further compromising laptop keyboards.
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Yes, often the customer literally doesn't know what they want. They know w hat they don't like though. They'll tell you that in the sales figures.
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Or, "The customer is always right!"