You should probably add that despite the fact that the US version includes only a digital copy of X-2, it will require that the X cartridge be inserted in the Switch to play it. That is the most absurd thing I've ever heard of. EDIT: Oh, so reading up on it, it seems that X-2 is being treated like "DLC"; hence, it needs "the game" to play it.
By the way, the Switch is also kind of unique in that, at least for multi-region games, my experience has been that the game will tend to play in the language set on the console (if the base game supports it). For example, the Japanese physical version of I am Setsuna plays in English on a US console (I presume because the console is set to the English language). One thing that fascinated me with the Wii U is that, since I had that console set to Spanish, Breath of the Wild's Dialog and subs were automatically set to Spanish using the US version.