“In retrospect, the Nintendo DS prepared the world for the iPhone, and for the explosion in touchscreen smartphone gaming that would eventually kill off the whole idea of a handheld games console. We don’t need them any more, now that we have one device that fits in our pockets and can do everything from giving us directions and taking photos to playing games. The DS was a half step between the Game Boy and the smartphone – a device that played games but could also do other things”
https://www.theguardian.com/games/2024/nov/12/pushing-buttons-nintendo-ds-at-20-smartphone-gaming