I agree on the simplistic side, like it was way too easy, but honestly, after League of Shadows and Gabrych's run and the constant flow of "No Shiva is a monstrous being who hates Cass because she doesn't kill", I'd rather take something simple that can springboard into something better than another shitty retread.
Also, I appreciated the bits with Shiva trying to steer Cass into becoming her own woman, because I think Shiva understands that her daughter is at her best when she's following her own path. And the fact that she beat the shit out of her in #6 with ease is proof enough that being Orphan isn't that path. That, to me, should be the crux of their relation: Shiva wants Cass to find her way and be strong through it.>you just know that's what some hack would do.
Honestly, I think it'd be more likely for some hack to do a "Shiva wants to turn Cass into a killer because she believes only killers can be strong" story. That, to me, would be the cheapest and hackiest thing to do now and I'm terrified it'll be exactly what we get next time.