Why the producers chose these two unpleasant-looking actresses, particularly the ginger one, is beyond me. It's as if the producers are trying to make some point that eludes me. If they wanted believably strong yet decent-looking females they should have gone with Gina Carano or Katee Sackoff.
They needed actresses who would be visually believable to have survived Spartan training against men. Kennedy is 6'3", Culzac 6'1". Carano is 5'8", Sackhoff 5'6"
That makes sense I guess. Though I'm surprised Katee Sackhoff is only 5ft 6in. She looks considerably taller in the films I've seen. Maybe a better replacement for her would be Mackenzie Davis. In Terminator: Dark Fate she looked very tall, easily over 6ft.
Davis is probably way to expensive for the role. She's at film and leading TV series level I believe. The other 2 are probably very unknown and work at scale or slightly above.
I would rather see a good story than an actor's (or any sex) "good looks" or "smoking hot body." And I don't have an issue with sexual relations on a show, or nude/near nude actors. I just don't believe in casting based solely on looks.
True, may actors over the history of TV/Movies have been reasonably attractive. And many have not and still had powerful and successful careers; often headlining their projects.
It might also be mentioned that people's perception of attractiveness varies considerably. For example, my mother and sister thought/think that Tom Sellick was extremely attractive. My wife likes him as an actor, but thinks he's very plain and would never look at him as attractive.
Frankly i never really believed that Katee Sackoff could kick a reasonable fit guy butt. At least Gina was actually UFC Fighter. Its not a big deal to me if the spartan women are not attractive. You see women in the real military. Most them don't look like fashion models.
Expanse .... Cara Gee and Frankie Adams? I'll grant you Dominique Tipper is not a raving beauty, but they are all above average and fantastic in the series.
Maybe I'm weird but I find even Shoreh Agdashloo strangely attractive. It might have a lot to do with the costumes she wears throughout the series because she looks great every time she's on screen.