It is false to state that web pages for mobiles should have extensive content because web pages are actually developed to be as much concise as possible and provide links and hyperlinks for solving this problem of content searching and learning. While designing web pages, developers should take care of how the content is available and if all sources are reliable. Readers will rarely get interested in extensive and tiring content which requires a lot of attention and time. Rather, readers will get interested easier in web pages which provide as much online resources and hyperlinks for surfing on the web as possible.
The readers need to know the aspects of the topic that will broaden their knowledge and idea. So when designing a web page it is very good to provide extensive content such as hyperlinks to related articles on the same topic. To broaden their reading scope.
However this should be done cautiously, not to provide facets that will end up distracting the importance and the core aspect of the main topic.