Which do you think is Nintendo's most groundbreaking system, and why?

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SvennoJ said:

Wii is also groundbreaking for other reasons, mainly for tapping into the blue ocean and make video games easy / approachable for different generations, games the whole family can enjoy. That trend continued as well, 1-2 Switch for example was a hit for my younger kids to play with their grand parents. But then Switch kinda abandoned the blue ocean again, or the blue ocean lost interest.

Switch actually has quite a few blue ocean/casual/expanded audience successes; Ring Fit Adventure, Switch Sports, Animal Crossing, Stardew Valley, Hello Kitty Island Adventure, Suika Game...