Now of course, Switch obviously isn't getting every AAA third party title, it's still a tablet with clear limitations. But it's still a powerful, well designed piece of kit that speaks not just to Nintendo fans, but to the gaming audience as a whole. And that's why third party games are doing so well on it.
I need receipts. Octopath has broken 1 million, Skyrim has broken 1 million. Almost 20 million sold and only 2 third party games breaking a million is not an indicator that games universally sell well on Switch. I'll give you Nintendo games, no doubt, but third parties are high and dry for the most part. IMO, it's not getting every third party title because it doesn't make sense when you account for opportunity costs of money and development man-hours. It's going to get some third party games that sell well, and some that don't. The market will correct and stop making products that don't sell.
Currently (Re-)Playing: Starcraft 2: Legacy of the Void Multiplayer, The Legend of Zelda: A Link to the Past
Currently Watching: The Shield, Stein's;Gate, Narcos