Speaking as a web designer, I can tell you it is impossible to design a custom website without the customers input. This is your business! You understand your customers better than the website designer does. You understand your product better than the website designer does. And you understand your business better than the website designer does.
Designing a website is a joint adventure. It takes both the input from the web designer and the client. If the web designer is smart he can really make it easy on both the client and himself.
What I mean is if you use WordPress to manage the content, logos, images, fonts, and layout on the pages your client will then be able to do a lot of the little things him or herself. Their happy because they no longer have to call you for every little change and your happy because your able to design and set the site up a lot quicker.