Trying to make them some sort of enlightened ambassadors of peace is really hard when pretty much everything about them boils down to manifest destiny and keeping their master race uncontaminated.
But that's not what they're about.
That's "not what they're about" in the story arc you prefer.
The original basis for Greek myth was not feminist or egalitarian. It was equally patronizing (just woman being patronizing instead of men) it was chauvinistic, it was violent, it was isolationist.
The Greek myths themselves were about a male-dominated culture's worst nightmare, and this from culture that happily wrote comedies about women going on a sex-strike. But that "worst-nightmare" wasn't egalitarian Feminism, it was a mirror-image where women were a violent, repressive, emasculating counterpart to Greek men.
The original Wonder Woman was fun and comical and lighthearted with some bondage undertones. Maybe more than "some" and maybe more than "undertones" depending on your perspective. It wasn't feminist, and it wasn't egalitarian. Whatever you think of "WW 2 culture" the reality is, Feminism was well thought out, written and demonstrated in Western society long before WW 2. It obviously hadn't made huge political strides by then, but it existed in a recognizable form, and Wonder Woman wasn't that form.
I like George Perez, and I liked his WW run, but it wasn't realistic, it wasn't based on actual mythology, and it wasn't a logical world. A single gender isolationist culture isn't going to have any means of being egalitarian. They weren't even democratic. And while it would be nice if Perez' version had been the definitive orginal from decades earlier, it wasn't. It's just one version among many.
The choice to make the Amazons something less than enlightened is the author's choice, and that's the choice they made. It's not a betrayal of the main character's history, because that history is so varied.
Making a superior culture that's enlightened is very difficult because the writers probably aren't the Dalai Lama, and they aren't enlightened themselves and wouldn't know enlightened if it bit them on the toe. It's also boring. I'd be fine with making the Amazons perfect, if we never bothered to go back there. There's no drama in perfect.