You're again just substituting another subjective term. What does that even mean, "hero body"? And of course it's not JUST you - I'm sure some other people share your preference. Maybe even a substantial number. That doesn't make it not a preference, just one shared among many people. And those preferences change, all the time, and easily.
What you're asking for may be your preference, but it's also a bit unreasonable - not just because it endangers the health of actors (and the fact that people CAN do it doesn't mean it's good for them) but also because it proliferates the use of body-image stereotypes that we as a society should probably emancipate ourselves from. Sure they have their own history, their own associated aesthetics - so did wasp waists at some point. That doesn't mean they're something we as a society trying to better ourselves should perpetuate.
That they cast the role as they did is a GOOD thing overall, because it works against a kind of aesthetic that has a lot of problems attached to it. And you and many other people may prefer something else (and that's your right), but your preference doesn't make this any less problematic.