Cheng Xin, compared to Luo Ji, has next to zero initiative and is a paper thin character which seems to only be there to metaphorically scream "woman are weak and bad for civilization".

The whole section of the book/civilization where everyone is feminized and most of the toxic male behaviors have been repressed is depicted as a "bad thing" leading to weak people and a weak civilization.

The first book was decent, certainly good, science fiction, with an endearing new scooby mystery at every chapter leading into another mystery. But the other two were bad. Going on in bad tolkien-ism (I've beared reading the Silmarillion three times) with overlong descriptions of unimportant details and derailing into ideology every two paragraphs.

Mind you, weak && bad does not imply inconsequence.

Try to put the PC for our time aside, and think about this again. In the cold and cruel universe, what would survive?

Advance, advance at all costs.

Edit:

You don’t have to save the universe in bold to become a character.

Being paper thin and then destroy the 3 dimensional universe, on behalf of the will of mankind?

She lets it end. No one apart from the mysterious (urg) race of aliens is trying to destroy the universe by collapsing it, they might as well be nothing, and story telling wise they're just a natural disaster without agency. She just stays in her dimensional safe box and doesn't take action. Her only actions are choosing to let things happen, but she's never the one putting them in action.

Also, the goal isn't/shouldn't be growth at all cost in a story. The axiom of Liu Cixin is his theory of "The Dark Forest", which is what it is, a literary axiom, not an universal truth.

to clarify, "advance" in "forward", not to develop or grow

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Chen Xin is selected to represent the will of the mankind (or she would've been purged quickly after showing the inabilities) so the character should be thin in this sense, which reflects the very opposite character, `Thomas Wade`.

So I understand the story as, that humanity chose to destroy itself in honor of what they value.

>Cheng Xin, compared to Luo Ji, has next to zero initiative and is a paper thin character which seems to only be there to metaphorically scream "woman are weak and bad for civilization".

I interpreted it differently, the fact that some male characters can be less empathetic and could potentially solve some crisis does not mean that all men or all women are X, I am bad with names so I don't remember them, but in the end why did the man let her take the final decision about the secret project/attack ? (it seemed out of character or a way to place the hard decision on other IMO)

Thomas Wade, her ex-boss, the man of cold hard decisions, a stereotype in its own right.

One of the most out of character decisions event in the books. As with any "out of character action" a character can take, the blame lies in the author. Like in the question "who would win between Superman and Goku ?" the answer is in the author, not the characters. The author forced a narrative to prove the point that Cheng Xin wasn't able to do the hard choices.