^ it isn't, at least not in the traditional sense. you can play as a female trainer and still get all shippy scenes that exist (varies by girl), and there's at least one girl whose route becomes more intimate with a female trainer (entirely separate route, or exclusive writing...)
(and if that's still not your thing, yeah there's a ton of shippy stuff between the girls themselves that you can focus on. sometimes like in tama's case, that even overshadows the trainer stuff in quantity. i just specify the above because, as somebody who came from imas, it's crazy how lesbian friendly it is)