The Wii was it's own console because of it's controller. If the PS4 is different from PS3 because of more powerful hardware, the Wii is different from GC due to the controller. And DS is certainly not GBA. And the Wii U internally was very different from Wii.
The original post I've quoted stayed that a new Switch with basically a more powerful hardware and pretty much new features but overall the same hardware would be nice but since it's Nintendo, it wouldn't happen. So I decided to show how that exactly what Nintendo is actually doing it for years, releasing pretty much the same console with more power and new features. The Wii added motion control to the Gamecube with more power and the Wii U added HD support and the gamepad. The DS added a second screen to the Game Boy Advance and the 3DS added 3D support, with obviously more power every time.
"Quagmire, are you the type of guy who takes 'no' for an answer ?"
"My lawyer doesn't allow me to answer that question"
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