This document that you are now reading was not prepared in hypertext because it is intended for printed distribution as well as online distribution. The skill of writing well in hypertext is different in quality from other kinds of writing, but one can become proficient at it. Because of the ease of copying and distributing information, any leak of private information can become global. In the days of paper documents, if you showed one copy of something to a person who wasn't supposed to see it, the chances of this being damaging were very low. In the world of electronic communication you cannot show somebody something without giving them a copy of it, which in turn gives them the ability to give copies to others.
Leaks can spread very rapidly in electronic communication.
Permanence Telephone systems are designed not to store information. It requires a conscious act to record a telephone call. Historically the law has had much to say about the legality of such recordings. You must assume that every message you have ever sent is out there somewhere in dead storage. If you make a copy of electronic information, the copy is indistinguishable from the original.