Just remembered one cool thing about the Nintendo DS. Thanks to its dual screens and the stylus there were lots of “games” that made it serve as an electronic Japanese dictionary and Kanji learning tool and many Japanese learners used it for that exact purpose (I bought mine just for Kirby Canvas Curse though 🙃):
There were also lots of games exploiting that setting and they offered unique gameplays that you couldn’t find on other hardware.
What would be really cool is if we had a similar software offering on Android that exploits the foldable nature of those phones in a similar way to the Nintendo DS, that would definitely win me over.