The Switch starts at a lower price point, it’s available at Walmart, it’s more durable for the average child to handle, and Mario/Pokemon/Zelda are what someone like Warren Buffet might call a “brand moat”, where nothing’s really going to interfere with that business model.
It’s close enough to doing everything or else you’ll be under leveled. I’m doing whatever I can find, and it frequently leaves me about one level lower than the lowest level baddies I can find.