Wii/DS each had ten 10-million-plus sellers. Switch has five and it's not even 2 years old

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Well, it's official now; as of the 31st of March 2021, Switch has 11 games with over 10 million sales a piece, surpassing Wii and DS. And it still has likely years ahead of it to get more. (Splatoon 3, BOTW2, and Pokemon Legends and D/P are guaranteed)