It's an interesting point, and I agree with it politically, but in the books it's made clear secunits look androgynous and non-human.
Some change between media change is always going to happen. I think Skarsgård is doing as good a job as can be done with his face. I'm making peace with it. Maybe the bigger problem is the dismissiveness of the portrayal of Preservation Alliance society. But we did live in the Corporate Rim!