And yet this article mentions that some of those classic massive selling hits of their IP are having an issue on mobile for other platforms.

This is what you're missing and will continue unless fresh new ideas or implemention to use those IP evolve behind classic implementation.
For me personally ... Zelda BOTW is amazing from what I've seen. yet it's THE ONLY game, personally, I'd be interested in owning a Switch! Metroid was supposed to have a new game in the full Prime series (aka Game Cube era) - until that I'm not buying. Mario Odyssey again only on switch. Switch isn't the platform of this thread and thus irrelevant. Most gaming on Nintendo's IP are not only on their own platforms.