Why spend more money on mobile data when I can cache as much data as possible? I have a complete archive of Wikipedia (Kiwix EN all maxi) I can query from anyw

Why spend more money on mobile data when I can cache as much data as possible? I have a complete archive of Wikipedia (Kiwix EN all maxi) I can query from anywhere in the world, I have Organic Maps with as many maps segments I might need, I have the 5 last unwatched episodes of the TV shows I currently watch synced, as well as a good portion of my music library. I could never do that with the normal onboard storage in most phone.