There's a range, though, it's not binary. Sure, Soul Calibur wasn't ever fully rooted in realism, but in the first game, almost the entire cast was based on historical cultures and weapons. And I think the way they approached it was neat. It makes no sense that Sophitia dresses up like she's from ancient Greece when the game takes place during the Renaissance, but this kind of mish-mash lead to an interesting aesthetic and design.The series has never fully stuck to realism anyway, even with their very first release.
But now, rather than a small percentage of new characters being completely out-there, it's 100%. We've got a character who looks like he's from a sci-fi anime and a character who likes to summon a shield out of thin air in order to use it as a hoverboard.