That's how some people do their "computing" these days, if they do any that deserves the name at all. I had to do some of that on vacation. With a modern phone it's possible, but mentally taxing. Phones feel like MS-DOS operating systems, where each application is fullscreen. Most people are just consumers. This is probably true for Anki decks as well. Only a small minority creates decks, the vast majority only consumes.