Depending on usage patterns this assumption might not hold. Improvements in cameras etc are causing the sizes of the photos and videos that people take to huge

Depending on usage patterns this assumption might not hold. Improvements in cameras etc are causing the sizes of the photos and videos that people take to hugely increase in size. The prior ipad you spoke of might have only recorded 720p video, while the new Pro likely does at least 4k. If they use their ipad to record video of family events, that 1tb might represent the same usage as the old one.