we already have Nintendo games on a different console: mobile.

Sure you could argue that the original GameBoy was inferior. Pea green screen, with four shades of pea green. No backlight. Highly inferior to the Sega GameGear.

And the DS. Super inferior to the PSP.

And the Switch compared to the Series X? There's no competition!

But that means nothing, because Nintendo worked within the limitations of the hardware and produced AMAZING games. Specs don't matter if you know how to use them to still make great games.