There's another half of the interview where they talk about what might get added for the West and additional topics.
Polygon said:Tokyo RPG Factory announced yesterday that its upcoming role-playing game, I Am Setsuna, would launch this summer on PlayStation 4 and PC via Steam. Notably absent was news of a Vita version, which accompanied the game's launch on PS4 in Japan. According to director Atsushi Hashimoto, the team chose to instead focus on a gameplay experience built for a larger screen when bringing the game stateside.
"I think the focus was leaning more toward that sense of immersion, being able to jump into the world on a larger screen," Hashimoto told Polygon via translator. "That's one of the bigger elements that sort of drove that decision for the no Vita plan.
"Of course, there is the technical market aspect as well. Unfortunately the Vita market isn't as large as the console and the PC-based [market] ... that's the sort of direction the team decided that they wanted to take for the U.S. release, was to rely on the players that are on the Steam platform as well."
Source: http://www.polygon.com/2016/3/15/11238124/i-am-setsuna-vita-western-releaseWhen asked if the company still sees the Vita as a viable platform, Hashimoto laughed.
"We definitely see the Vita fans, and we acknowledge that there are very passionate fans out there, and we think it's great," he said. "We do feel it's a viable sort of platform. Of course, it's just a matter of scale. We don't mean to give you the impression that we feel that the Vita market is weak or anything; by no means do we want to make it seem like it's any sort of inferior platform. It is a platform where there are very passionate fans that love the games that are on that platform."
He added that the console is perhaps more popular in Japan because of a large commuter culture.