The usefulness of materials on the Internet for the user is quite understandable. Where else can one find such a complete answer to any question? But site builders may think - if almost all queries are given results, why articles on his own site?
Of course, you can post pictures and games on the site. But then the user simply cannot find you. After all, most people come from search queries. Unless you have the funds for a global advertising campaign, of course. And without texts, your site will be practically empty in the eyes of search engines.
Then you have to forget about earnings. After all, the better the site traffic, the more expensive the links from it are, the more clicks on the advertisement. And a user who is keen on a game or communication is unlikely to notice an advertisement at all. Another thing is an article and an advertisement on the same topic. Your benefit from articles is net income from ad clicks.
The text remains the main part of the site. Eventually, if all resources become entertaining, the usefulness of the Internet will disappear altogether. And the competition will come such that it will be very difficult and costly to create websites. Therefore, projects are mostly created with useful content.
What about uniqueness? There is no benefit in texts copied from other sites. Neither a search engine will place you in the top 10 search results, nor a user will be delighted when they find an article that is already familiar to him. Plus, while your site can be a commercial project, don't forget about moral goals. Success is achieved by resources created for people, not for making money on advertising.
Are the topics already covered? And you approach them differently. An example can be taken from magazines - narrowly thematic editions have been published for decades, but in the new issue they still have something to say. After all, different topics can be covered from different angles. Then any text on your site will be useful, and the question "why do we need articles" will disappear by itself.
Articles will also allow you to make your resource special in the eyes of users. An original approach to the presentation of material, a fascinating presentation style, fresh and relevant topics - when faced with such texts, the user will want to return to your site again.