Can't speak to everyone else's motivations, but mine were (a) portability and (b) Switch hype train. Even so, I was pretty amazed when I saw the picture of all those copies in one place.
On a game like this, there really isn't much to differentiate between Switch and PS4 on a power or graphics basis. So portability becomes a dominating argument in favour of Nintendo. Also, I think the fact that the Switch is still pretty thin for JRPGs could play a role. There's a bunch of good ones coming, but for right now, it's practically Xenoblade Chronicles 2 or Lost Sphear or bust for new games.







