so you would consider wild arms 4/5 and valkyrie profile 2 srpg's?
WA4/5 definitely have elements of it but is way more constrained (maybe if it were about positioning on a large field like most SRPGs rather than just an 8 hexagon grid), and VP2 has full movement rather than being a grid. Not that some SRPGs depend on a grid (Phantom Brave, and for a hazier example Growlanser), but VP2's system is notably distinct from most anything else so there really isn't a good comparison. That, and while not required by SRPGs or exclusive to them the fact all non-battle stuff is handled through menus in Devil Suvivor is something you'd normally see out of strategy RPGs.
Dave IS ultimately right though, it's simply not black and white categorizing games. Hell, forget Devil Survivor, it wouldn't even be worth arguing against were it not for the traditional battles when units clash: it's GROWLANSER that can very easily be argued as a traditional RPG and not all that dissimilar from games like Baldur's Gate, Dragon Age, or KotOR when it comes to gameplay, but in the end positioning IS relevant, the development team has an SRPG heritage forwards and backwards (being responsible for Langrisser AND Devil Survivor), Growlanser II went much closer to a proper SRPG, and Atlus HAS called it an SRPG, so there we go.