Just like with math, I get the impression that sometimes the level of jargon/legalese used is an attempt to differentiate oneself from the everyday person. The same information could theoretically be put forward in a way which is understandable to all, not just those with a degree.
From experience, the information provided on gov.uk can be incorrect because it is simplified too much. Very important aspects are lost and it becomes misleading.
As the saying goes, simplify as much as possible, but not more.
Where there is essential complexity, explain the complexity clearly and skillfully.
The book Style: Towards Clarity and Grace is a good instruction manual, especially for those who have read Strunk & White
> prescriptivist
Isn't all advice on how to accomplish a goal going to be prescriptivist?