Well you'll probably hate how I tend to write characters for all kinds of settings, I have a wide range of non-white non-straight, non-Christian, non-human characters with all kinds of temperament and I'm not doing for 'virtue signaling' but rather I make them like that because want to make them like that.
As for Blake and Yang, they do have ship tease but I don't think they're an outright couple, that scene to me is more a friend giving the other support against their abusive, clinging former boyfriend, which is that scene in question involves Blake and Yang facing off against Adam, the aforementioned abusive former boyfriend. And honestly there alot more evidence to suggest that those two are heterosexual then homosexual as both tend to have more indications that they are more interested in the opposite sex rather than the same, yang clearly more interested in men than women. hell to me it seems like Ilia, the girl who had a crush on Blake while she was in the white fang, seem to be implied incompatible orientation. Now there is a chance that both Yang and Blake are bisexual, it's all in the hands of the creators rather or not they want to go that route and can easily have them bi but with leanings towards the opposite sex.
Usually, I chuck up any ship tease that wasn't intended as relationship fumbling on the writer's part, I mean, Yang’s method of showing sisterly affection is very physical, largely due to her serving both the ‘Cool Older Sister’ and ‘Mother’ for her younger sister after her stepmom/her sister’s mum’s death and their father subsequential breakdown as a result, so, holding someone she views as a sister isn’t out of the realm of possibility for her, she kinda does the same with her younger sister, but again, if the creators want to go down that route, I’m not going to stop them, far from it, so all my opinions on it may not matter much in the end as its’ ultimately in the hands of the people making the setting in the first place and if they want to include gay people in it then you shouldn’t bitch about it.