But the Legion are sixist, slaving, murderers, how does banning a female courier from playing Legion create a bad image? It's already cemented in the Legions ideals and they aren't the good guys either.
Real life banning of a path due to six / sixual preference in game.
VS in game implied ( overtly ) sixism, not held up except via references, no actual penalty to player, or player choice based on six.
It's a matter of saying to a real person you can't do this in game because of your six.
And saying the fictional characters would treat your fictional PC in a way so appalling but not actually doing so based on your PC's six.
Hence best of both worlds.
A female player, or male playing female can run around for the legion and dream up a slap dash reason why they can.
At the same time the legion can be shown as to how they treat everyone else not player controlled.
So IRL a player is not penalised but also the faction remains what it is, just not towards the player.
Requiring a mcguffin on behalf of the player to explain how, what, why, rather than enforced banning of a group of gamers.