It doesn’t matter if it’s open or closed. The problem is the unnecessary complexity and lack of straightforward and standardized meaning. If you want to customize the way you view the web in general, you will either limit yourself to small changes like ad blockers, or you will need a handcrafted custom CSS for every site you visit. There’s no real standardization in formatting. Everything is just a div with an arbitrary name.

RSS feeds could address much of this, but it would need to be taken a step further.