Yeah, you're probably right. Her life is boring, so there's really nothing to touch on. Whereas, Sasuke and Naruto, and lots of other shinobi have actually been through real sh!t, they've felt pain, anguish and an immense need to define themselves after such hurt. Sakura doesn't know any of that. The only thing she'd ever gain is strength, and watching her gain it would be boring, as there wouldn't be any pay off, heck she doesn't even have a really powerful reason to want to seek strength. Kishi tried with the "saving Sasuke, easing Naruto's pain", her rivalry with Ino, and trying to establish a concept of worth built around her strength. But it all failed. And it doesn't matter. Because really, Naruto and Sasuke are the perfect pair. Their identities work in sync, and the alterations made in the manga to support each character formed the best possible version of Naruto and events. It's true.
Naruto's scale adjusted to match each character's (Naruto and Sasuke) paths. It was all built around them and THEIR development. The rest of K11 really had no chance because this manga really isn't about them.