This is literate programming! Why not just put the codebase in the wiki and not have two representations diverging. Why can't we have diagrams and links in code

This is literate programming! Why not just put the codebase in the wiki and not have two representations diverging. Why can't we have diagrams and links in code??? We can, like https://observablehq.com https://observablehq.com notebooks, it's a better representation for understanding.