I'm not the first person to mention "introverted," you're just not looking in the right place. There's even an article from Marvel's '70s in-house fan magazine, FOOM (by Defenders writer David Anthony Kraft) about this aspect of her personality.
And again, "introverted" and "reserved" are personality traits, not the absence of them.
The thing is, no, she's not more nuanced and fleshed-out and interesting, she's just easier to sum up quicker and not defined by her relationships to men. You just seem really angry that people don't accept your rules that a character must be easy to sum up without reference to other characters, but it just ain't so. Otherwise Quicksilver would be more popular than his sister, because he has a personality that's easy to sum up. But while I love Quicksilver, he wasn't very popular until Days of Future Past.Quicksilver's sister. Magneto's daughter (once upon a time). The Vision's wife. Wonder Man's crush. Member in good standing of the Avengers (once upon a time). Nothing about her though. I'm not a fan of the character, but not because I haven't given the character a fair chance. I've read probably more comics with her involved (I'd say starring, but that'd be a ridiculous statement) than most comic fans I know. I'm not speaking out of ignorance of who the character is or was. It'd be easier for a fan's narrative to think so, but it's just not true. If I were a fan of the character I'd direct my anger not at someone like myself for pointing out her flaws, but towards the company and the writers/editors who've allowed her to exist for over 50 years without any significant development. Kamala Khan is a more nuanced, fleshed-out, and interesting character than the Scarlet Witch. And she's existed for about 2 years. Whose fault is that? Not mine.
I don't think you're ignorant of the character, she just doesn't fit your criteria for a good character, which is fine. What keeps happening is that you demand everyone else abide by your idea of what makes a good character.