Implicitly, people who are too old (or too European) to have grown up with an NES.

But yeah, I 100% agree that the overwhelming draw of Nintendo consoles is their exclusives, so it's mostly orthogonal to Xbox/PS/PC. If you want to play Mario or Zelda or Pokemon or Fire Emblem, you've got one choice. The common idea that the Steam Deck is competing with the Switch is almost entirely wrong.