Then you're playing the wrong game. D&D is built around the concept of morality and ethics not as abstract notions but as practical and objective forces of the physical universe. In D&D's standard cosmology, Good or Evil are no less real than gravity and follow rules just as strict.

Not only that, but again, you're emulating a genre that's all about playing the super innocent, pure and loving girl gifted with magical powers to save the world from cartoonish and cackling evil.

Specifically because she has such a pure and caring heart that it makes her super special and uniquely gifted.

That IS the kind of show being emulated.

How does taking away the alignment restriction here make any sort of sense? Or more to the point, would you honestly prefer a generic magical girl class?

In which case, it begs the question, what's wrong with the Champion, Stargazer and Empath which are, for all purpose, generic magical girl classes.

If you take away its purpose to allow people to roleplay as old school magical girl (with their specific brand of classic abilities) away, then what's the point? The class has no reason to exist then.

In fact, I'll even illustrate my point further. You know what we call a generic Paladin? A Divine Champion. Why is the Paladin still something people use despite there being a perfectly good alternative?

Because the Paladin is cool and fits a very specific niche of the genre like a glove. And there's nothing wrong with that.