Most female game journalists aren't hot. Female spokeswomen and hosts tend to be, because that's their job.
In the case you pointed out, Mica only has the job she does because her dad is famous and Geoff from Achievement Hunter is kind of a starfucker, and Ashley mostly has the job (and that entire channel exists) solely because she's dating (engaged to, now) one of the most powerful people in the company. Before that, she was a Fragdoll, which means she was hired solely because she was a hot chick who played video games, with "hot" being the primary job qualification.
As for the periodic male "hosts" on The Know, Ryan basically started out as off-camera tech support who slowly morphed into being an Achievement Hunter, Jon used to be their t-shirt design guy who eventually talked his way into getting a show of his own, and Adam is also a tech guy who mostly only gets facetime in stuff because he was friends with Joel (who is one of the original founders of the company). None of them were hired to be on-camera personalities at all, meaning appearance was never a factor in their employment at any point in their career (except for Ryan, who actually WAS a male model at one point when he was younger, but that wasn't why Rooster Teeth hired him).
Fun fact - most of the actual "journalists" for that channel are the people writing the scripts, who you never actually see because they're very much behind the scenes talent. And at least one of those is a relatively unattractive female.
but why the spokeperson rarely have good looking men? I remember in the know a time when Ashley was there whit a did that had a tremendously huge head almost as big as his torso and my friends thought it was a comedy video instead of a game news chanel ---