Please have a look at the problem statement written by Tim Berners-Lee. Transfer on author demand. Transfer unconditionally to all sites. Wastes resources globally when used for small readership, and doesn't scale very high. Transfer on receiver demand.
Network suffers when readership is high.
When an individual makes a piece of information available, currently that individual's chooses the application, which implies the protocol which will be used. Misuse of resources or bad performance occurs when the wrong protocol is used. Here are three examples of a use of one protocol when another would have saved resources. The use of mailing lists to distribute information for a very wide audience most of whom will not be interested, wastes time, disk space and bandwidth. Documents on a single server generally do show good locality.