[dsc_]

Because your HTML generating AI framework would not be able to deal with Mandy from upper management that wants that one button to have a rounded edge in the upper right corner just like the button she saw on Bloomberg, her favorite website, they make a ton of money so there should be no reason Mandy can't have a button with a rounded edge in the upper right corner, except that your framework can't deal with questionable input from humans at which point you will try to override it with CSS and another thing and another thing and before you know it you'll have a colleague come up to your desk complaining about the fact the codebase has 4 years worth of overriding CSS spaghetti and wondering if switching to ThatOneFramework^tm he read about on hackernews the other day will solve the issue of backend/frontend integration.