They are run by the equivalent of dwarven master blacksmiths... They're one of the few gaming companies with employees on staff with more than 40 years experience of game dev (and whom have ONLY ever worked at Nintendo their entire careers) in charge of things.

That's great if you like Zelda and Mario games... but because they're run by a bunch of old-school grandpas... they're not good at much else.

Terrible store, multiplayer, ancillary modern network-driven services like voice chat and partying up, little to no 3rd-party support (whether it's games, media apps, or even tech integrations with formats like Dolby ATMOS), and - as a benefit - really terrible device security so it's usually pretty easy for folks to reverse engineer, run custom boot-loaders / jailbreak / scrape their store servers / etc. - stuff that companies like Sony and Microsoft either never had issues with - or have taken seriously long enough that they have locked down.

The only reason they're still in business is that they still do the one thing that matters most the best - design really great game-play mechanics for IP that is beloved by multiple generations of gamers who will overlook everything else.