If you look at almost any company website, you can spot the same restrictive conformity. There’s a site-wide template, which means that every page has the same menus and links, regardless of how irrelevant they might be to the subject. Some content management systems force the same image size or proportions on every page. Write something in the “headline” box and it appears on the page in exactly the same style as every other page on the site, whether the subject is an advertising landing page or the company’s terms and conditions.
It doesn’t have to be this way. Website designers just do what they need to do. If you ask them for a way to specify different menu systems, image arrangements or headline sizes, they can do that. Yes, even retrospectively. Don’t be a slave to someone with no imagination who works in IT, not marketing.