The purpose of the S4 for Genesis iconic shape is really to work with Gen-X in allowing you to bring over all the S4 morphs and S4 characters into Genesis. Just using her to transform Genesis to the basic S4 shape isn’t really addressing more than a fraction of her potential.
You don’t need the S4 shape, just the V4 shape.
True, converted morphs or characters are usable against any shape or none (and I’ve had fantastic results in the past with applying characters for A4 or G4 to just plain old V4), but you need the S4 shape to get them looking a near twin to their original Gen 4 version.
(Oh, and belated thanks to everyone who answered my Evo Expressions question).