See, I like the idea, but mainly as a response to grimdark dystopias that I feel are—I don't know. Counterproductive, maybe? Which is to say Not All Dystopias and Not All Grimdark but a lot of it is grating on me when our world is as dystopic as it's been in my lifetime. I don't think it's a genre or should be, and I think it's something distinct from happy endings; I'd say that, for example, Rogue One is an incredibly hopeful movie with a depressing ending. The Expanse is one where I do agree; it's a dark setting where characters can still choose to fight back and act decently, as opposed to, say, Game of Thrones. So I think it's a useful concept.

I think it's a scale rather than a category. Sliding Scale of Optimism Vs. Pessimism works just as well as a framing device for those with an allergy to the punk postfix. Where I think it's a useful concept is in making a distinction (which the author doesn't) between optimism and comfort, which can both be valuable, but in radically different ways.

Broken Earth is full of sexual violence, holy shit. That's one of the underlying themes of the series. What the actual fuck.