This seems like something intentionally easy for AI to consume, but hard for humans to read. Why not allow for formatting and the ability to organize documents

This seems like something intentionally easy for AI to consume, but hard for humans to read. Why not allow for formatting and the ability to organize documents into a hierarchy via links? We could use some kind of standard, generalized markup language for this, so that a variety of agents acting on behalf of the user ("user agents," so to speak) can present the information in a visual and interactive manner while the source text remains machine-readable.