Maybe it is addressed in the article (I find it hard to read), but I always thought it was because internet on computers is/was quite reliable, while on mobile

Maybe it is addressed in the article (I find it hard to read), but I always thought it was because internet on computers is/was quite reliable, while on mobile it is either not so reliable or data plans were quite expensive. Like you want to download the app and some data for the app to be able to use it when you are offline.