Pronouns are actually an upcoming update. As you can imagine, making sure all the text in the game can dynamically update to given pronouns of specific cats is rather complex, which is why a neutral they/them was used originally. But, regardless, we could argue this all day and likely get no where. The bottom line is that this is the decision that has been made by the contributor team and is very very very unlikely to ever change. You do not have to play the game if it makes you uncomfortable and you can always change the gender of the cat if it displeases you.