In that case, I'll respond that I think the notion of casual sexism as it relates to "dragonboobs" is ridiculous and insulting. When in our culture the icons of feminism, such as Beyonce, revel and even gloat about their sexuality, it makes it absurd, counter-productive and paradoxical to simultaneously insist that in our fantasy art, women need the equivalent of a fantasy hijab because God forbid we think of them as sexy.
1) Bad example - Beyonce is an icon, sure. But for just the reason you mention, some do question her feminist cred*.
But, more importantly, look back at my description of casual sexism - imposing male-oriented sexual imagery
onto something that doesn't really need it, and probably shouldn't have it, without really thinking about it. Beyonce is, first and foremost, in the business of making and selling pop/dance music. You know, the stuff played in clubs, where young folks go to drink alcohol, dress provocatively, and gyrate to show their attractiveness and fitness? In effect, Beyonce creates content for human mating rituals! Of course, sex is appropriate to her image! There is nothing *casual* about sexuality for her. It is very considered and planned for effect.
However, last time I checked, that's not what D&D is about. Last time someone asked around here, folks broadly admitted that sexuality really plays little part in their games. Certainly, the core books don't have notable rules for it. Doesn't seem to be a focus of the game, as written. So, why should the art be about it?
2) Strawman. Nobody's talking about fantasy hijabs. The only statements I have seen are for having clothing that is actually suitable for the job the character is supposed to be doing - functional armor, in current discussion. And nobody here is even talking about *all* fantasy art. We are talking about gaming books, only. Given that the game focuses on adventure and action, rather than sexual relationships, showing women performing in the action and adventure roles, rather than sexual roles, seems pretty reasonable.
Feminism has long had a very strong vibe of wanting to have it's cake and eat it too, and now that it can't reasonably make a case anymore that it's fighting for real injustices...
I don't know how you get that idea. I think finding out would go rather beyond the topic of sexism in gaming. But, either you live in another world, in which there aren't still injustices, or you are thinking about something other than what I know of as feminism.
*We can find a more relevant icon. One with credibility in terms of popularity, success/earnings, relevance to the fantasy genre, and with feminist credentials: Emma Watson.