It’s not depressing that the sort of art that started all this still gets made, and I think there is a place for that kind of character design. The depressing bit is that we can’t seem to have an intelligent discussion about it.
The tradition of big-busted female characters in fantasy stretches back decades, and this isn’t a surprise in an art form that’s so heavily consumed by men. The covers of the pulp novels showed that men were supposed to be covered in muscles, able to swing huge swords with little difficulty, festooned with beautiful women and their heaving, barely-covered breasts. These are effective, primal images.
This tradition is its own problem, simply because it’s been done. It’s old, creaky, and a relic from another time. There is nothing wrong with taking a swim in these waters, but it’s also worth pointing out how obvious, boring, and overdone they’ve become since the '70s.