Comment by anon7000

Well, part of that is a business need (your app/website/whatever is an extension of your brand, which is a very important part of making money). The other part is there are actually many valid ways to style a button, or have some kind of hover animation, or some kind of navigation bar.

Sure, there are some guidelines and best practices, but there are just infinite ways to display information to people. You can't just look at a technical specification for how well X/Y/Z performs because design is subjective and humans are all different. Whereas none of your users will complain if you use Redis (or similar) for caching something on the backend.