> "For example it's generally horrific, for a person with a scientific background, to read the "scientific" section of the mainstream newspapers"

Because it's a mainstream newspaper. That section is made so that ordinary people can understand the content and get value from it. Specialist magazines etc. go into the detail someone with prior knowledge in the subject would need.

'Good' newspapers go into subjects in detail, providing the most important information, but also make it understandable to everyone.