It would be "interesting" to try to download every single Wikipedia article in PDF format. How much disk space do you think that would take? How long would it take you to make each PDF? Kiwix ZIMs scrape all the content of Wikipedia in hundreds of languages. Additionally, we make content available offline for many different sources, not just Wikipedia. I'm sorry this completely free open-source app made by volunteers is of no use to you, that's too bad. But perhaps think that it might be of use to others before you dismiss it as "pure nonsense".