I can understand that perspective because a lot of the times I also feel that way towards A/B/O stories that repackage women's struggles with little to no nuance. But in this case, I would have to disagree because this manga's A/B/O premise is centered on the world's declining female population (as opposed to stories where women exist in the background while men/male omegas are centered when exploring patriarchal violence/discrimination). The patriarchy was never dismantled with women's disappearance, but reinforced once half(?) of the male population developed the ability to get pregnant.
It's an interesting concept imo!
^ This, plus the author said on twitlonger that she felt the media already uses the grief and struggle of women to get off on womens suffering and thus trivializing it for the sake of entertainment. Meanwhile men's struggles andsuffering is taken as serious when compared to women. So she wanted to flip it and have men struggling and suffering due to issues that women face.
She also mentioned she was tired of the uptick of media in Japan having plot lines with women being abused, assaulted, killed, ect for the sexual gratification of the viewers, tragedy porn, and or woman in the fridge type purposes, and didn't want to add more of that to the world. She also said she'd rather see men suffer.

Omega struggles feel so redundant to me. Why invent a new gender to experience oppression when real women have face it forever? Omegas only exist on paper, so it honestly feels like a way to appropriate real-world women's suffering and make it about men.