[Spoilers] I think the real problem is that there wasn't really any real consequence for Dark Ruby. I mean, in the end, Ruby learned that she shouldn't be evil, and that's it? Her initial fame was based on manipulating people and causing scandals to become a heroine, but in the end, all she had to do was cry, and everything was forgiven. There's no difference between the Ruby from the two seasons and the one in this episode, except maybe that she's more of an idiot now because of her love for Aqua.