Console is too weak
*Looks at all the times that weak consoles succeeded*
This. This. This.
Wii is Nintendo's best-selling home console. It was far weaker than the PS3 and Xbox 360. Switch is also very weak as a home console (though good to excellent in specs as a portable). 3D games in the DS were kind of an after-thought. Nintendo upped some of the specs in development after learning about a PlayStation Portable in development. And then the DS became Nintendo's best-selling piece of hardware. It trails the PS2 only by 3 million units, pretty much within a margin of error. The 3DS was way weaker than the Vita, and stomped it. Game Boy was weak compared to its competitors, and dominated the market.
And then you look at powerful specs in consoles. GameCube was the second-best sixth gen console in terms of specs and still got third place. N64 was beaten handily by the newbie, the PlayStation.
Xbox One X was the most powerful console to date, and failed to sell much. Xbox One is still under 50 million, and the X probably only sold 5-7 million of Xbox One consoles.
In almost every console generation, the platform that sells the most hardware is not the one with the best specs. Pretty sure SNES is the only outlier. Though technically consoles like the CD-i had superior specs, but they're not really in the same class as SNES, Genesis, and TGFX16.
Lifetime Sales Predictions
PS4: 130 mil (was 100 million) Xbox One: 55 mil (was 50 mil) Switch: 110 million (was 73, then 96 million)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima